FILED United States Court of Appeals Tenth Circuit 

### April 21, 2017 Elisabeth A. Shumaker Clerk of Court PUBLISH UNITED STATES COURT OF APPEALS TENTH CIRCUIT

STATE OF NEW MEXICO, Plaintiff-Appellee, v. DEPARTMENT OF THE INTERIOR; RYAN ZINKE, in his official capacity as Secretary of the Interior, * Defendants-Appellants, and PUEBLO OF POJOAQUE, a federally-recognized Indian Tribe, Intervenor Defendant-Appellant. Nos. 14-2219 & 14-2222

Appeal from the United States District Court for the District of New Mexico (D.C. No. 1:14-CV-00695-JAP-SCY)

J. David Gunter II, U.S. Department of Justice, Environment & Natural Resources Div., Washington, D.C. (John C. Cruden, Assistant Attorney General, Steven Miskinis and Yosef M. Negose, U.S. Department of Justice, Environment & Natural Resources Div., Washington, D.C., with him on the briefs), for Defendants-Appellants.

* Pursuant to Fed. R. App. P. 43(c)(2), Ryan Zinke, who is the current Secretary of the Interior, is automatically substituted for Sally Jewell as Defendant in this case.Steffani A. Cochran, Pueblo of Pojoaque Legal Department, Santa Fe, New Mexico, and Scott Crowell, Crowell Law Offices, Sedona, Arizona, for Intervenor Defendant-Appellant. Eric D. Miller, Perkins Coie, Seattle, Washington (Jennifer A. MacLean, Perkins Coie, Washington, D.C., and Jeremiah L. Ritchie, Office of the Governor, Santa Fe, New Mexico, with him on the briefs), for Plaintiff-Appellee.

BeforeHOLMES , McHUGH , andMORITZ , Circuit Judges.

HOLMES , Circuit Judge.

The State of New Mexico (“the State” or “New Mexico”) brought suit against the Department of the Interior (“DOI”) to challenge its authority to promulgate the regulations found at 25 C.F.R. § 291 et seq. (“Part 291”). The challenged regulations concern the process under which Indian tribes and states negotiate compacts to allow gaming on Indian lands. Congress established in the Indian Gaming Regulatory Act (“IGRA”), 25 U.S.C. § 2701 et seq. , that states have a duty to negotiate in good faith with tribes regarding compacts and that tribes could enforce this duty by bringing suit in federal court. As the Supreme Court would later decide, however, Congress lacked the authority to make states subject to suit by Indian tribes in federal court. Seminole Tribe of Fla. v. Florida , 517 U.S. 44 (1996). However, the Court left intact the bulk of IGRA, and Congress has not amended it in the intervening years.

2More specifically, IGRA provides that when a tribe believes a state has failed to negotiate in good faith, the tribe may sue in federal court to, inter alia , obtain an order enjoining a state to negotiate a gaming compact and potentially subjecting the state to court-ordered mediation or the issuance of gaming procedures by the Secretary of the Interior (“the Secretary”) without the state’s consent. However, the Supreme Court, in Seminole Tribe , made clear that a statecan invoke sovereign immunity in response to such a suit, thus effectively sidestepping the process that IGRA contemplates. See id. at 47 (“We hold that notwithstanding Congress’ clear intent to abrogate the States’ sovereign immunity, the Indian Commerce Clause [U.S. Const. art. I, § 8, cl. 3] does not grant Congress that power, and therefore [25 U.S.C.] § 2710(d)(7) cannot grant jurisdiction over a State that does not consent to be sued.”). In response to Seminole Tribe , DOI promulgated Part 291 to allow the Secretary to prescribe gaming regulations for a tribe following the dismissal of a tribe’s suit against a state on sovereign-immunity grounds. As relevant here, the Part 291 process was implicated after the Pueblo of Pojoaque tribe (“the Pojoaque” or “the Tribe”) sued New Mexico under IGRA and the State asserted sovereign immunity. Following the dismissal of the case on sovereign-immunity grounds, the Pojoaque asked the Secretary to prescribe gaming procedures pursuant to Part 291. Before the Secretary did so, New

3Mexico filed the present suit, seeking a declaration that the Part 291 regulations are not a valid exercise of the Secretary’s authority. The Pojoaque intervened. The district court granted New Mexico’s motion for summary judgment and denied that of DOI, holding that the Part 291 regulations are invalid and barring the Secretary from taking any further action on the Pojoaque’s request for the issuance of gaming procedures under them. DOI and the Pojoaque now appeal from this order; they challenge the State’s standing, the ripeness of the dispute, and the district court’s holding that Part 291 is an invalid exercise of the Secretary’s authority. Exercising our jurisdiction under 28 U.S.C. § 1291, we conclude that the dispute is justiciable and affirm the district court’s judgment.
I A In 1987, the Supreme Court held that states lack regulatory authority over gaming activities on Indian land except where Congress has expressly provided for such authority. California v. Cabazon Band of Mission Indians , 480 U.S. 202, 207 (1987). Following this ruling, Congress enacted IGRA, 25 U.S.C. § 2701 et
seq ., which gives states a role in the regulation of Indian gaming. The act divides gaming into three classes. See 25 U.S.C. § 2703. The present case concerns Class III gaming, which includes the most lucrative forms of gaming. 25 U.S.C. § 2703(8); see Seminole Tribe , 517 U.S. at 48 (“Class III gaming . . . includes such things as slot machines, casino games, banking card games, dog racing, and

4lotteries.”). Under IGRA, Class III gaming activities “shall be lawful on Indian lands only if such activities are conducted in conformance with a Tribal-State compact entered into by the Indian tribe and the State [where the gaming is located] . . . that is in effect.” 25 U.S.C. § 2710(d)(1)(C). An Indian tribe desiring such a compact “shall request the State . . . to enter into negotiations for the purpose of entering into a Tribal-State compact governing the conduct of gaming activities. Upon receiving such a request, the State shall negotiate with the Indian tribe in good faith to enter into such a compact.” 25 U.S.C. § 2710(d)(3)(A). This case concerns how the process unfolds in the event that these negotiations do not commence following a tribe’s request or are unsuccessful. The statute provides that if no agreement is reached within 180 days of a tribe’s request for negotiation, the tribe may initiate a “cause of action . . . arising from the failure of [the] State to enter into negotiations with the Indian tribe for the purpose of entering into a Tribal-State compact . . . or to conduct such negotiations in good faith.” 25 U.S.C. § 2710(d)(7)(A)(i) and (B)(i). It further provides that federal district courts shall have jurisdiction over such a suit. 25 U.S.C. § 2710(d)(7)(A)(i). If the district court in which a suit is filed finds that the state has failed to negotiate in good faith, “the court shall order the State and the Indian Tribe to conclude such a compact within a 60-day period.” 25 U.S.C. § 2710(d)(7)(B)(iii). If the parties fail to reach an agreement within sixty days,

5the statute outlines a process under which the tribe and the state each would submit a proposed compact to a mediator, and the mediator would select one. 25 U.S.C. § 2710(d)(7)(B)(iv). At that point, the state may consent to the selected compact or it may decline to do so. If the state does not consent, the mediator is required to notify the Secretary, who “shall prescribe, in consultation with the Indian tribe, procedures . . . consistent with the proposed compact selected by the mediator . . . under which Class III gaming may be conducted.” 25 U.S.C. § 2710(d)(7)(B)(vii)(I) to (II). The Supreme Court’s ruling in Seminole Tribe complicated the process outlined above. In that case, the Court held, in the context of the Indian Commerce Clause, that “the Eleventh Amendment prevents congressional authorization of suits by private parties against unconsenting States,” and therefore a case against a state concerning whether it has failed to negotiate with a tribe in good faith cannot proceed unless the state has statutorily or otherwise waived its sovereign immunity or fails to assert its immunity as a defense. 1 517 U.S. at 72. However, states still retain the obligation to negotiate in good faith under 25 U.S.C. § 2710(d)(3)(A). Following Seminole Tribe , DOI issued the Part 291 regulations to provide an alternative administrative remedial scheme that applies when a state asserts

1 See, e.g. , Rincon Band of Lusieno Mission Indians v. Schwarzenegger, 602 F.3d 1019, 1026 (9th Cir. 2010); Northern Arapaho v. Wyoming , 389 F.3d 1308, 1313 (10th Cir. 2004).
6sovereign immunity in a § 2710(d)(7) suit. 25 C.F.R. § 291.1. Under these regulations, when a district court dismisses a suit following a state’s assertion of sovereign immunity, the tribe “may ask the Secretary to issue Class III gaming procedures” by submitting proposed procedures. 225 C.F.R. §§ 291.3, 291.4. Upon receipt of such a request, the Secretary must “notify the Indian tribe in writing whether the Indian tribe meets the eligibility requirements in § 291.3.” 25 C.F.R. § 291.6. If the tribe meets those requirements, which are not directly at issue here, then the Secretary is required to submit the tribe’s proposed procedures to the state, which then has sixty days to comment on the proposal. 25 C.F.R. § 291.7(a), (b). The Secretary “will also invite the [state] to submit an alternative proposal.” 25 C.F.R. § 291.7. The nature of the remainder of the process depends on whether the state submits its own proposal. In cases in which the state declines to do so by the end of the sixty-day comment period, the regulations set forth a process under which the Secretary ultimately approves the tribe’s proposal, and accordingly issues “Secretarial Procedures” allowing gaming on the tribe’s land, or disapproves the tribe’s proposal for one of seven reasons listed in Section 291.8(a). See 25 C.F.R. § 291.8. On the other hand, if the state submits an alternative proposal within the sixty-day period, the Secretary must appoint a mediator to “convene a process to

2 Note that the regulations do not require any finding that the state failed to negotiate in good faith, only that the case was dismissed after the state asserted sovereign immunity.
7resolve differences between the two proposals.” 25 C.F.R. § 291.9(b). The mediator is charged with “select[ing] from the two proposals the one that best comports with the terms of IGRA and any other applicable Federal law. The mediator must submit the proposal selected to the Indian tribe, the State, and the Secretary.” 25 C.F.R. § 291.10(b). Following the mediator’s decision, the Secretary must either approve the chosen proposal, and issue Secretarial Procedures, or disapprove it for one of the seven reasons listed in Section 291.11(b) (which mirror those found in Section 291.8(a)). 25 C.F.R. § 291.11(a) and (b). If the proposal is not approved at this stage, then the Secretary “must prescribe appropriate [Secretarial Procedures] within 60 days under which Class III gaming may take place that comport with the mediator’s selected proposal as much as possible, the provisions of IGRA, and the relevant provisions of the laws of the State.” 25 C.F.R. § 291.11(c).
B The genesis of this case is the Pojoaque’s attempt to negotiate a Class III gaming compact with New Mexico. More than 180 days after the Pojoaque submitted a request to negotiate with the State, the Tribe brought suit under IGRA in federal district court, seeking a declaration that New Mexico had failed to negotiate in good faith. New Mexico asserted sovereign immunity, and the court dismissed the case on that basis. The Pojoaque then asked the Secretary to initiate the Part 291 process and issue Class III gaming procedures. The

8Secretary subsequently informed New Mexico that DOI had determined, pursuant to 25 C.F.R. § 291.6, that the Pojoaque had met the eligibility requirements of the Part 291 regulations; the Secretary thus invited the State to comment on the Pojoaque’s proposal or submit an alternative proposal within sixty days. Before the end of the sixty-day period, New Mexico filed this case against the Secretary, seeking a declaration that the Part 291 regulations are invalid and an order enjoining DOI from developing Secretarial Procedures for the Pojoaque pursuant to the regulations. The Tribe filed a motion to intervene; the district court granted it, but only on a permissive basis, pursuant to Federal Rule of Civil Procedure 24(b). More specifically, the court allowed the Tribe “to intervene as a defendant . . . and join in the other Defendants’ motion for summary judgment on the purely legal question of [the regulations’] validity.” Aplee.’s Supp. App. at 71–72. New Mexico then filed a motion for a preliminary injunction, which the district court denied. Following the denial of its motion, the State submitted comments and an alternative proposal to the Secretary. See Aplee.’s Br. at 14. 3 The State, and the Secretary joined by the Pojoaque, subsequently moved for summary judgment. The district court granted New Mexico’s motion and denied that of the Secretary, which also effectively denied the Tribe relief. The

3 In a letter to the State, the Secretary opined that New Mexico could participate in the Part 291 process “under protest” and without waiving “its rights to challenge a decision that might result in issuance of gaming procedures for the Pueblo.” Aplee.’s Supp. App. at 2. 9court ruled that (1) New Mexico had standing to bring suit, (2) its challenge was ripe for judicial review, (3) the Part 291 regulations were not a valid exercise of the Secretary’s power under IGRA, and (4) Seminole Tribe did not require the court to hold any additional IGRA provisions invalid, an issue that the Pojoaque had raised in its memorandum in support of the Secretary’s motion. The court thus barred the Secretary and DOI “from taking any further action to enforce 25 C.F.R. § 291 et seq .” Aplts.’ App. at 66. The Secretary and the Pojoaque now appeal.
II On appeal, DOI and the Pojoaque contend that (1) New Mexico lacks standing to challenge the Part 291 regulations, (2) the State’s claim is not ripe, and (3) the regulations are a valid exercise of the Secretary’s authority under IGRA. The Pojoaque further asserts that if we were to conclude that Part 291 is invalid, we should undertake a severability analysis and, in light of the Supreme Court’s decision in Seminole Tribe , strike down additional portions of IGRA because IGRA’s jurisdiction-granting clause is not severable. Below, we first determine that New Mexico has standing and its claim is ripe; thus, we may properly exercise jurisdiction. Next, we conclude that the Part 291 regulations are not a valid exercise of the Secretary’s authority; specifically, they are invalid because they are foreclosed by IGRA’s unambiguous text. Lastly, we determine that the severability issue raised by the Pojoaque is properly before us but that the

10jurisdiction-granting clause is severable. We thus affirm the district court’s grant of New Mexico’s motion for summary judgment and its denial of the Secretary’s motion for summary judgment. A DOI first contends that New Mexico lacks standing. 4“The constitutional requirements for standing are (1) an injury in fact, (2) a causal connection between the injury and the challenged act, and (3) a likelihood that the injury will be redressed by a favorable decision.” Roe No. 2 v. Ogden , 253 F.3d 1225, 1228–29 (10th Cir. 2001) (citing Vt. Agency of Nat. Res. v. United States ex. rel.
Stevens , 529 U.S. 765, 771 (2000)). Before us, DOI challenges New Mexico’s standing only on the basis of the first requirement, arguing that the State has suffered no injury in fact. The district court rejected this argument, finding that the State had demonstrated an injury sufficient for standing purposes. We review this finding de novo, see Roe No. 2 , 253 F.3d at 1228, and conclude that New Mexico has demonstrated an injury in fact on two independent bases: first, it has suffered a procedural injury in that the Part 291 regulations have stripped New Mexico of certain procedural protections or benefits conferred by IGRA; and, second, it has been subjected by DOI to a harmful forced choice regarding whether to participate in the allegedly unlawful Part 291 process. Our

4 For convenience, we refer throughout this opinion to the positions advanced in DOI’s briefs as DOI’s arguments; however, the Pojoaque join DOI’s briefs in full. The Tribe also separately advances severability arguments addressed infrain Part II.D. 11confidence in our holding on both fronts, moreover, is bolstered by our recognition that, as a state, New Mexico is entitled to special solicitude on the issue of standing.
1 New Mexico has standing because it has suffered a procedural injury. The Supreme Court has recognized that, for standing purposes, a party’s injury may be a procedural one “so long as the procedures in question are designed to protect some threatened concrete interest of [the party] that is the ultimate basis of [its] standing.” Lujan v. Defs. of Wildlife , 504 U.S. 555, 573 n.8 (1992); see also Summers v. Earth Island Inst. , 555 U.S. 488, 496 (2009) (recognizing that standing may be grounded in “a procedural right [that a person has been accorded] to protect his concrete interests ” (quoting Lujan , 504 U.S. at 572 n.7)); WildEarth Guardians v. EPA , 759 F.3d 1196, 1205 (10th Cir. 2014) (noting that, to demonstrate an injury in fact, a plaintiff need only show that the procedures at issue “are designed to protect some threatened concrete interest of [the person] that is the ultimate basis of standing” (alteration in original) (quoting S. Utah Wilderness All. v. Office of Surface Mining Reclamation & Enf’t , 620 F.3d 1227, 1234 (10th Cir. 2010))). To establish standing in such circumstances, a plaintiff “need show only that compliance with the procedural requirements couldhave better protected its concrete interests,” WildEarth Guardians , 759 F.3d at 1205, and thus that the procedural violation created a “risk of real harm,” Spokeo, Inc.

12v. Robins , --- U.S. ----, 136 S. Ct. 1540, 1549 (2016). Further, the Court observed
in Lujan that “‘procedural rights’ are special: The person who has been accorded a procedural right to protect his concrete interests can assert that right without meeting all the normal standards for redressability and immediacy.” Lujan , 504 U.S. at 572 n.7 (“Thus, under our case law, one living adjacent to the site for proposed construction of a federally licensed dam has standing to challenge the licensing agency’s failure to prepare an environmental impact statement, even though he cannot establish with any certainty that the statement will cause the license to be withheld or altered, and even though the dam will not be completed for many years.”). We have frequently found standing based on a procedural injury in cases in which environmental groups have alleged that an agency failed to follow the required procedures in taking an action that negatively impacted members’ concrete interest in protecting and enjoying the affected land. See, e.g. , WildEarth Guardians , 759 F.3d at 1205 (concluding that the failure of the Environmental Protection Agency (“EPA”) to consult with another federal regulatory agency before issuing a federal implementation plan was a procedural injury that supported standing because adherence to procedural requirements could have better protected plaintiff members’ concrete interest in enjoyment of land); S. Utah Wilderness All. , 620 F.3d at 1235 (concluding that plaintiff had standing to challenge Office of Surface Mining Reclamation and Enforcement’s

13failure to prepare a recommendation to DOI regarding a private party’s mining plan because this procedural injury affected plaintiff’s concrete interest in protecting the area where mining was to take place); see also Summers , 555 U.S. at 497 (suggesting that plaintiffs would have had standing based on procedural injury had they been denied the opportunity to file comments on a Forest Service plan that would have impinged on their concrete interest in observing nature in the specific area affected). In addition to environmental cases, courts have also relied on the procedural-injury doctrine in other contexts in which statutorily mandated procedures were designed to protect plaintiffs’ interests. See, e.g. , Parsons v. U.S. Dep’t of Justice , 801 F.3d 701, 712–13 (6th Cir. 2015) (concluding that “Juggalos,” fans of the Insane Clown Posse musical group, had standing where they alleged that the National Gang Intelligence Center had violated the Administrative Procedure Act (“APA”) in issuing a report on gang activity without adhering to required procedures, thus causing them to be discussed in a report, which in turn caused concrete harm to their reputational interests); Beeman v. TDI Managed Care Servs., Inc. , 449 F.3d 1035, 1039–40 (9th Cir. 2006) (holding that plaintiff pharmacies “ma[d]e out a procedural injury: the failure on the part of the [Pharmacy Benefit Managers] to follow the statutory procedures requiring [that] they conduct studies and provide them to third

14parties,” a failure that threatened the pharmacies’ interest in the outcome of future third-party payor decisions). In this vein, New Mexico has demonstrated a procedural injury sufficient for Article III standing in the present case. Specifically, New Mexico asserts that the Part 291 regulations deprive it of a procedural right that IGRA accords states—specifically, the right to a judicial finding that it has failed to negotiate in good faith, before a mediator or the Secretary are authorized to become involved in defining the terms under which Class III gaming can be conducted within its borders. See 25 U.S.C. § 2710(d)(7)(B)(iii)–(vii) (outlining the process under which a tribe may ask the Secretary to prescribe gaming procedures following a judicial finding that a state has failed to negotiate in good faith). Indeed, absent a judicial finding that a state has not negotiated in good faith, a tribe cannot secure Class III gaming under the regime of IGRA without directly engaging with a state and hammering out the terms of a compact. See Texas v. United States , 497 F.3d 491, 494 (5th Cir. 2007) (“If the court finds the state negotiated in good faith, the tribe’s proposal [for Class III gaming] fails”); id. at 508 (“IGRA allows Class III gaming to be imposed by the Secretary following exhaustion of the judicial good-faith/mediation process . . . .”). This procedural right is designed to protect the State’s interest in helping to shape without federal interference the terms under which the Pojoaque may conduct Class III gaming within its territory. Even DOI recognizes that the State’s interest in such gaming

15terms is not insubstantial or speculative. See Aplt. DOI’s Opening Br. at 22 (“[T]he State’s concrete interest lies in the terms on which a tribe may (or may not) conduct gaming—for example, the types of gaming allowed or whether the tribe will rely on the State for particular services.”). It is clear to us that the loss of this procedural right—which the Part 291 regulations would allegedly effect—at least threatens this concrete interest by fundamentally changing the process under which a state and a tribe negotiate a compact and, more specifically, altering the circumstances under which the tribe may bypass the state and seek relief from DOI. See Texas , 497 F.3d at 508 (“Under the Secretarial procedures, however, it matters not that a state undertook good-faith negotiations with the tribe: The Secretary may prescribe Class III gaming irrespective of a state’s good faith.”). This substantial risk to this interest establishes the requisite injury in fact for standing purposes. See Spokeo , 136 S. Ct. at 1549 (noting that a procedural violation may amount to an injury in fact where it creates a “risk of real harm”). We therefore conclude that New Mexico has demonstrated that it has suffered a procedural injury as a result of the Part 291 regulations. The validity of this conclusion is underscored by the D.C. Circuit’s analysis
in Delaware Dep’t of Nat. Res. & Envtl. Control v. Fed. Energy Regulatory
Comm’n , 558 F.3d 575 (D.C. Cir. 2009), which discusses the Fifth Circuit’s reasoning in Texas v. United States , a case in which Texas challenged the Part 291 regulations on the same basis that New Mexico has here and the court held

16that Texas had standing to do so. 5Although the Fifth Circuit’s opinion did not explicitly characterize the injury that Texas had suffered as a procedural one, in later interpreting its injury-in-fact ruling, the D.C. Circuit commented that the key to the court’s conclusion that Texas had suffered an injury-in-fact was that Texas had been deprived of an alleged statutory procedural protection—a court finding on whether Texas had negotiated in bad faith—that bore on the likelihood of an ultimate concrete injury, i.e. , the Secretary’s approval of an Indian gaming proposal. Delaware Dep’t of Nat. Res. & Envtl. Control , 558 F.3d at 579. Thus, the D.C. Circuit reasoned, the injury that prompted the Texas court to find standing was the procedural injury to Texas of being deprived of a bad-faith finding. This characterization of Texas aligns perfectly with our conclusion that New Mexico has suffered a procedural injury sufficient to support standing in the present case by being deprived of a judicial determination regarding its alleged failure to negotiate in good faith.

5 In Texas , a panel of the Fifth Circuit issued three separate opinions. First, Chief Judge Jones, writing in part for herself and in part for the court, held that Texas had standing and that the dispute was ripe for review. 497 F.3d at 495–99. Next, she argued that the Part 291 regulations were invalid under Chevron step one, though she also stated that, even reaching step two, the regulations were impermissible. Id. at 499–511; see generally Chevron U.S.A., Inc. v. Nat. Res. Def. Council, 467 U.S. 837, 842–43 (1984). Judge King joined the chief judge’s opinion as to the justiciability issues, but would have found the statute ambiguous in light of Seminole Tribe , though she concurred that the regulations still should be invalidated but under Chevron step two. 497 F.3d at 511–12. Judge Dennis dissented, arguing that the statute was ambiguous and that the regulations should be upheld under Chevron step two. Id. at 513–26. We find most persuasive the opinion of Chief Judge Jones. In particular, we depart, infra , from the position of the concurrence and dissent that IGRA is ambiguous. 17Here, New Mexico has a procedural right to a judicial determination of bad faith followed by the statutory mediation process. That process is designed to protect a state’s economic and other interests in the regulation of Class III gaming on tribal land, and the circumvention of the statutory process threatens to harm those interests by allowing the issuance of gaming procedures without the state’s consent. This deprivation of a procedural right designed to protect a concrete interest is sufficient to establish standing.
2 In addition to the procedural injury discussed above, we alternatively conclude that New Mexico has suffered an injury because the Part 291 regulations have imposed a forced choice on it: At the end of the process that the regulations contemplate, the Secretary will necessarilyissue procedures that will govern the Tribe’s Class III gaming activities in New Mexico; if New Mexico wants to have any input into the content of those procedures, it is forced(i.e., compelled) to participate in the Part 291 process, even though it deems that process unlawful, thereby suffering a cognizable injury for standing purposes. Put another way, the Part 291 regulations injure New Mexico by forcing it to choose between participating in a process it considers unlawful and forgoing any benefit from that allegedly unlawful process—viz. , the benefit of being able to offer input, presumably beneficial to its interests, relating to the content of those procedures.
See Thomas v. Union Carbide Agric. Prods. Co. , 473 U.S. 568, 582 (1985)

18(“[A]ppellees clearly have standing to contest EPA’s issuance of follow-on registrations pursuant to what they contend is an unconstitutional statutory provision. They allege an injury from EPA’s unlawful conduct—the injury of being forced to choose between relinquishing any right to compensation from a follow-on registrant or engaging in an unconstitutional [arbitral] adjudication.”);
Texas , 497 F.3d at 497 (“Texas’s only alternative to participating in this allegedly invalid process is to forfeit its sole opportunity to comment upon Kickapoo gaming regulations, a forced choice that is itself sufficient to support standing.”). In concluding that Texas had been subjected to a forced-choice injury, Chief Judge Jones stressed that “[t]he alleged injury is not hypothetical because the Secretarial Procedures have already been applied to Texas.” 497 F.3d at 497. In this regard, the judge observed: “The Kickapoo Tribe submitted a Class III gaming application to the [DOI], the Secretary notified Texas and the tribe that the application met the relevant eligibility requirements, and the Secretary invited Texas to comment on the proposal and submit an alternative proposal.” Id. As noted supra , New Mexico has confronted essentially the same scenario, and we concur with Chief Judge Jones’s reasoning in holding that this renders NewMexico’s alleged injury (resulting from a forced choice) concrete and nonconjectural; it is an independently sufficient injury for standing purposes. The soundness of this conclusion, moreover, is underscored by the Court’s observation in Lujan regarding the nature of the alleged injury for standing

19purposes that is effected where the plaintiff is the target of the government’s action: “When the suit is one challenging the legality of government action or inaction . . . [and] the plaintiff is himself an object of the action (or forgone action) at issue . . . , there is ordinarily little question that the action or inaction has caused [the plaintiff] injury . . . .” Lujan , 504 U.S. at 561–62; see Texas , 497 F.3d at 498 (quoting the same passage of Lujanto support a like proposition).There is no doubt that New Mexico is the object of the government’s forcedchoice action; under Lujan ’s reasoning, that means ordinarily New Mexico will have suffered an injury from that action. And, based on our analysis supra , we believe that is so, and this injury under the circumstances here is sufficient for standing purposes. 3 In reaching these standing conclusions, we are mindful of the Supreme Court’s statement in Massachusetts v. EPA that states are “entitled to special solicitude in our standing analysis.” 549 U.S. 497, 520 (2007). We have previously recognized that Massachusettsrequires that a state be afforded some special consideration when analyzing its standing to bring suit, despite “the lack of guidance on how lower courts are to apply the special solicitude doctrine to standing questions.” Wyoming v. U.S. Dep’t of Interior , 674 F.3d 1220, 1238 (10th Cir. 2012); see also New Mexico ex rel. Richardson v. Bureau of Land Mgmt. , 565 F.3d 683, 696 n.13 (10th Cir. 2009) (noting that consideration of

20special solicitude supported conclusion that state had standing); Utah ex rel. Div. of Forestry, Fire & State Lands v. United States , 528 F.3d 712, 721 (10th Cir. 2008) (same); cf. Texas v. United States , 809 F.3d 134, 162 (5th Cir. 2015) (“[O]ur determination that Texas has standing is based in part on the ‘special solicitude’ we afford it under Massachusetts v. EPA . . . .”), aff’d by an equally divided court , 136 S. Ct. 2271 (2016). Thus the Supreme Court’s direction that we give states special solicitude in analyzing standing provides further support for each basis establishing New Mexico’s standing. In sum, we conclude that the State has demonstrated injury in fact, and we therefore reject DOI’s challenge to its standing to bring the present case.
B We turn next to DOI’s argument that the present case is not ripe for review because the Secretary has not yet prescribed any gaming procedures for the Pojoaque and may never do so. The district court found that New Mexico’s claim was ripe. Reviewing this determination de novo, Utah v. U.S. Dep’t of Interior , 535 F.3d 1184, 1191 (10th Cir. 2008), we agree. “The ripeness doctrine aims to prevent the courts, through avoidance of premature adjudication, from entangling themselves in abstract disagreements.” Rural Water Dist. No. 2 v. City of Glenpool , 698 F.3d 1270, 1275 (10th Cir. 2012). “In evaluating ripeness the ‘central focus is on whether the case involves uncertain or contingent future events that may not occur as anticipated, or indeed

21may not occur at all.’” Initiative & Referendum Inst. v. Walker , 450 F.3d 1082, 1097–98 (10th Cir. 2006) (quoting New Mexicans for Bill Richardson v. Gonzales , 64 F.3d 1495, 1499 (10th Cir. 1995)). Specifically, in considering the ripeness of challenges to federal agency action, we have considered four factors: “(1) whether the issues involved are purely legal, (2) whether the agency’s action is final, (3) whether the action has or will have an immediate impact on the petitioner, and (4) whether resolution of the issue will assist the agency in effective enforcement and administration.” Qwest Commc’ns Int’l, Inc. v. FCC , 398 F.3d 1222, 1231–32 (10th Cir. 2005); accord Mobil Expl. & Producing U.S., Inc. v. Dep’t of Interior , 180 F.3d 1192, 1197 (10th Cir. 1999). Applying these factors, we agree with the district court that this case is ripe for review. Beginning with the first factor, the parties agree—as do we—that the issues in this appeal are purely legal. New Mexico challenges the Secretary’s authority to promulgate and enforce the Part 291 regulations as a matter of law; thus, the resolution of the merits of the parties’ dispute depends entirely on legal matters. Turning to the second factor, we think it clear that the relevant agency action—DOI’s promulgation of the Part 291 regulations—is final. As the Fifth Circuit explained in Texas , “[t]he challenged [regulations] are a ‘final agencyaction,’ as they are final rules that were promulgated through a formal, noticeand-comment rulemaking process after announcement in the Federal Register.” 497 F.3d at 499 (citing Abbott Labs. v. Gardner , 387 U.S. 136, 150–51 (1967),

22abrogated on other grounds by Califano v. Sanders , 430 U.S. 99 (1977)); see also Toilet Goods Ass’n, Inc. v. Gardner , 387 U.S. 158, 162 (1967) (“[T]here can be no question that this regulation—promulgated in a formal manner after notice and evaluation of submitted comments—is a ‘final agency action’ under [the APA].”); Nat’l Mining Ass’n v. Jackson , 768 F. Supp. 2d 34, 46 (D.D.C. 2011) (noting, as to agency’s argument that its actions could not be final until it granted or denied any permit it had subjected to the challenged process, that the agency had “misse[d] the point of the plaintiff’s claim: that the process itself [was] unlawful, and not simply any decisions that may result from the application of that process”). Because the regulations that New Mexico challenges here have been promulgated through a formal rule-making process, we conclude that the relevant agency action is final. 6 Moving on to the third factor, our next consideration centers on whether the agency’s action—promulgating the Part 291 regulations—has had or will have an immediate impact on New Mexico. The State argues that the regulations have had

6In discussing the second factor of the ripeness inquiry, the parties—in line with the district court’s analysis—focus on DOI’s determination that the Pojoaque are eligible to participate in the Part 291 process. This determination is undoubtedly a final agency action, see 25 C.F.R. § 291.6(b) (“The Secretary’s eligibility determination is final for the Department.”), and DOI does not argue otherwise. But DOI maintains that the State’s claim will not be ripe until the agency actually promulgates gaming procedures for the Pojoaque. This focus on the act of issuing procedures, however, is misplaced. New Mexico challenges the regulations themselves, and, accordingly, their promulgation constitutes the relevant agency action for ripeness purposes. 23a direct impact: relying on the Fifth Circuit’s analysis in Texas , New Mexico contends that it has been “forced to choose one of two undesirable options: participate in an allegedly invalid process that eliminates a procedural safeguard promised by Congress, or eschew the process with the hope of invalidating it in the future, which risks the approval of gaming procedures in which the state had no input.” Aplee.’s Br. at 35 (quoting Texas , 497 F.3d at 499). We agree. Indeed, in light of our standing reasoning supra , and our resulting conclusion that New Mexico has suffered a cognizable injury because of the forced choice imposed on it by DOI, we have no difficulty determining that the impact of the agency’s regulations has already been felt by New Mexico. Cf. Initiative & Referendum Inst. , 450 F.3d at 1097 (“Standing and ripeness are ‘closely related in that each focuses on whether the harm asserted has matured sufficiently to warrant judicial intervention.’” (quotingSkull Valley Band of Goshute Indians v. Nielson , 376 F.3d 1223, 1234 (10th Cir. 2004))). We are thus satisfied that New Mexico has already been impacted by the Part 291 regulations, and therefore the third ripeness factor also weighs in the State’s favor. Lastly, as for the fourth factor in the ripeness analysis, a decision from our court on whether DOI may subject states to the Part 291 process will patently assist the agency’s administration of the tribal-state compacting process. DOI argues that a ruling would not have such an effect because it has yet to prescribe gaming regulations for any tribe under Part 291. But, again here, the critical

24point is that New Mexico challenges DOI’s authority to engage in the Part 291 process at all, not just to prescribe gaming procedures at its end. Moreover, “[n]othing would be gained by postponing a decision, and the public interest would be well served by a prompt resolution” of the validity of DOI’s regulatory scheme. Union Carbide , 473 U.S. at 582. We thus conclude that this final factor also supports the conclusion that the dispute before us is ripe. All four factors in the ripeness analysis weigh in favor of the case being ripe for adjudication. Furthermore, other courts have similarly found that plaintiffs have demonstrated ripeness in cases in which they have been subjected to an administrative process, even where that process is still ongoing. See, e.g. , Middle S. Energy, Inc. v. Ark. Pub. Serv. Comm’n , 772 F.2d 404, 410–11 (8th Cir. 1985) (“[The plaintiff] challenges not the state’s ultimate substantive decision but its authority to even conduct the contemplated [administrative] proceeding. It can hardly be doubted that a controversy sufficiently concrete for judicial review exists when the proceeding sought to be enjoined is already in progress.”); Nat’l Mining Ass’n , 768 F. Supp. 2d at 46 (finding that plaintiffs’ claim was ripe where they challenged an EPA permitting process, despite fact that they had yet to be granted or denied any permit through that process). In sum, New Mexico’s challenge to the Part 291 regulations is ripe: its challenge does not invite our involvement in an abstract disagreement, but rather seeks a resolution of a

25concrete dispute concerning final regulations issued by DOI that have already had an impact on the State. C Having established that New Mexico has standing to challenge the Part 291 regulations and that the dispute is ripe, we now ask whether the regulations are a valid exercise of DOI’s authority under IGRA. Reviewing the district court’s conclusion de novo, Clements v. Serco, Inc. , 530 F.3d 1224, 1227 (10th Cir. 2008), we conclude that they are not. In determining whether an agency’s regulations are valid under a particular statute, as the Supreme Court’s decision in Chevroninstructs, we begin with the question of whether the statute unambiguously addresses the “precise question at issue.” Chevron U.S.A., Inc. v. Nat. Res. Def. Council , 467 U.S. 837, 842 (1984); accord United Keetoowah Band of Cherokee Indians of Okla. v. U.S. Dep’t of Hous. & Urban Dev. , 567 F.3d 1235, 1239–40 (10th Cir. 2009); see also Keller Tank Servs. II, Inc. v. Comm’r , 848 F.3d 1251, 1269 (10th Cir. 2017) (noting that “[t]he Chevron -deference analysis proceeds in two steps,” and explicating them both). “If Congress has spoken directlyto the issue, that is the end of the matter; the court, as well as the agency, must give effect to Congress’s unambiguously expressed intent.” Keetoowah Band, 567 F.3d at 1240 (emphasis added). However, if the statute is silent or ambiguous as to the precise question at issue, a court must determine whether to afford the agency’s interpretation Chevron

26deference. Id. Such deference is appropriate if “‘Congress delegated authority to the agency generally to make rules carrying the force of law’ and the agency’s interpretation of the statute was issued pursuant to that authority.” Carpio v. Holder , 592 F.3d 1091, 1096–97 (10th Cir. 2010) (quoting United States v. Mead Corp. , 533 U.S. 218, 226–27 (2001)). If these conditions are satisfied, then we defer to the agency’s interpretation of the statute as long as it is not “arbitrary, capricious, [n]or manifestly contrary to the statute,” id. at 1096 (alteration in original) (quoting Herrera–Castillo v. Holder , 573 F.3d 1004, 1007 (10th Cir. 2009)). We thus begin our analysis by defining the precise question and then considering whether Congress unambiguously addressed that question.
1 We begin by determining whether IGRA unambiguously answers the precise question at issue here. As other courts have recognized, “the resolution of this threshold inquiry will be at least influenced, if not determined, by how broadly we frame the ‘precise question.’” Bank of Am., N.A. v. FDIC , 244 F.3d 1309, 1316 (11th Cir. 2001); see also Cent. States Motor Freight Bureau, Inc. v.
Interstate Commerce Comm’n , 924 F.2d 1099, 1112 (D.C. Cir. 1991) (Silberman, J., dissenting) (“I think it very important to be said, that if the [court were to] read the ‘precise question at issue’ too broadly the Supreme Court’s decision in

27Chevroncan be undermined and appropriate deference to an agency interpretation would thereby be avoided.”). Here, the parties dispute how to frame the precise question addressed by the Part 291 regulations. On one hand, New Mexico urges us to adopt the framing used by the district court—viz. , the precise question at issue is “whether IGRA has spoken to the situations where the Secretary may adopt regulations allowing a Tribe to conduct gaming activities without a compact with the State.” Aplts.’ App. at 60. Under this framing of the question, the district court found that IGRA was unambiguous because the statute makes clear that the Secretary may only adopt such regulatory procedures after a federal court finds that the State has failed to negotiate in good faith and has ordered mediation between the parties. On the other hand, DOI argues that the question before us is whether the Secretary may prescribe gaming procedures for a tribe when a state asserts its sovereign immunity from a tribe’s suit, resulting in the suit’s dismissal. As explained below, we ultimately settle on a framing closer to the one the district court adopted. Although Chevron itself does not offer much discussion on how to frame the precise question at issue in a given case, the Supreme Court later described the step-one inquiry as whether “the statute is silent or ambiguous with respect to the specific issue addressed by the regulation .” K Mart Corp. v. Cartier, Inc. , 486 U.S. 281, 291 (1988) (emphasis added); see Chevron , 467 U.S. at 837

28(suggesting that the step-one analysis involves asking “if the statute is silent or ambiguous with respect to the specific issue”). Thus, in K Mart , the Court indicated that, at Chevron step one, courts should frame a question that correlates to the specific problem the regulation is designed to address or answer. And, later cases from the Court reflect adherence to this approach. See Mayo Found. for Med. Educ. & Research v. United States , 562 U.S. 44, 52 (2011) (evaluating a regulation characterizing medical residents as employees, rather than as students exempt from the Federal Insurance Contributions Act (“FICA”), and holding that the statute did “not define the term ‘student,’ and does not otherwise attend to the precise question whether medical residents are subject to FICA” (emphasis added)); see also Harbert v. Healthcare Servs. Grp., Inc. , 391 F.3d 1140, 1148 (10th Cir. 2004) (finding, where regulation defined term “worksite,” that the precise question at issue was “whether Congress expressed a clear intent with respect to the meaning of ‘worksite’ for an employee who is jointly employed” (emphasis added)). However, we recognize that, in directly speaking to the specific regulatory question or problem, Congress need not “explicitly delineate everything an agency cannot do.” Contreras-Bocanegra v. Holder , 678 F.3d 811, 818 (10th Cir. 2012) (en banc) (“ Chevron does not require Congress to explicitly delineate everything an agency cannot do before we may conclude that Congress has directly spoken to the issue. Such a rule would ‘create an “ambiguity” in almost

29all statutes, necessitating deference to nearly all agency determinations.’” (quoting Prestol Espinal v. Attorney Gen. , 653 F.3d 213, 220 (3d Cir. 2011))); see also Prestol Espinal , 653 F.3d at 221 (“[A] ‘statute’s silence on a given issue does not confer gap-filling power on an agency unless the question is in fact a gap—an ambiguity tied up with the provisions of the statute.’” (quoting LinZheng v. Attorney Gen. , 557 F.3d 147, 156 (3d Cir. 2009) (en banc))). The Part 291 regulations prescribe the conditions under which the Secretary can issue Class III gaming procedures for a tribe that is unable to enter into a compact with a state. More specifically, they address the situation where a tribe’s compact negotiations with a state under IGRA have failed and the state has invoked sovereign immunity to the tribe’s IGRA lawsuit. See 25 C.F.R. § 291.1. They expressly present the question of “[w]hen may an Indian tribe ask the Secretary to issue Class III gaming procedures?” See 25 C.F.R. § 291.3. And they answer that a tribe may ask the Secretary to issue procedures when (1) it has submitted a written request to negotiate to the state; (2) the negotiations have been unsuccessful after 180 days from the receipt of the request; (3) the tribe sued the state, alleging bad faith; (4) the state raised the Eleventh Amendment as a defense; and (5) the court dismissed the case on that basis. Id. Though Congress did not envision the holding of Seminole Tribe , we conclude that it has spoken in IGRA to the specific question that Part 291 is designed to address: that is, when is

30the Secretary authorized to issue Class III gaming procedures for a tribe that has been unable to enter into a compact with a state?
2 Thus, we begin our Chevron inquiry by asking when (i.e., under what circumstances) can the Secretary issue Class III gaming procedures for a tribe that has been unable to enter into a compact with a state—for example, as most relevant here, because the state has invoked sovereign immunity to the tribe’s IGRA lawsuit. As the Supreme Court’s opinion in Seminole Tribe makes clear, at the time it drafted IGRA, Congress did not contemplate that it lacked the authority to make states subject to suit under 25 U.S.C. § 2710(d)(7). See Seminole Tribe , 517 U.S. at 76 (“Nor are we free to rewrite the statutory scheme in order to approximate what we think Congress might have wanted had it known that § 2710(d)(7) was beyond its authority .” (emphasis added)). Yet, despite Congress’s failure to foresee the Court’s ruling in Seminole Tribe , it spoke clearly in crafting a detailed remedial scheme that tightly circumscribed when the Secretary could issue Class III gaming procedures absent a compact. Notably, Congress established a judicial finding of bad faith negotiation by the state as a precondition for the issuance of such procedures. In conducting our Chevronstep-one analysis, we “[e]mploy[ ] traditional tools of statutory construction.” INS v. Cardoza-Fonseca , 480 U.S. 421, 446 (1987); accord Chevron , 467 U.S. at 843 n.9; De Niz Robles v. Lynch , 803 F.3d

311165, 1173 (10th Cir. 2015) (“[T]o reach Chevron step two the agency must first establish that traditional tools of statutory interpretation fail to reveal ‘what the law has always meant.’”). “These tools include examination of the statute’s text, structure, purpose, history, and relationship to other statutes.” Am. Fed’n of Gov’t Emps., Local 1592 v. Fed. Labor Relations Auth. , 836 F.3d 1291, 1295 (10th Cir. 2016) (quoting Harbert , 391 F.3d at 1147); see Keller , 848 F.3d at 1269 (“The ‘plainness or ambiguity of statutory language is determined by reference to the language itself, the specific context in which that language is used, and the broader context of the statute as a whole.’ If the statute is not ambiguous, our inquiry ends there.” (citation omitted) (quoting Robinson v. Shell Oil Co. , 519 U.S. 337, 340, 341 (1997))). Thus, we read statutory language in context because “[t]he meaning—or ambiguity—of certain words or phrases may only become evident when placed in context.” FDA v. Brown & Williamson Tobacco Corp. , 529 U.S. 120, 132 (2000). We also “must be guided to a degree by common sense as to the manner in which Congress is likely to delegate a policy decision of such economic and political magnitude to an administrative agency.” 7 Id. at 133 (citing MCI Telecomms. Corp v. AT&T Co. ,

7 The Court explained in Brown & Williamson Tobaccothat this analysis is applicable to Chevron step one and can constitute evidence of clear Congressional intent: Finally, our inquiry into whether Congress has directly spoken to the precise question at issue is shaped, at least in some measure, by the nature of the question presented. Deference under Chevron to an (continued...) 32512 U.S. 218, 231 (1994)). We begin with an examination of IGRA’s text and

structure.

a Here, unlike in Chevron—where the Court held that the broad language of the Clean Air Act did not foreclose the EPA’s interpretation, see 467 U.S. at 861—the text of IGRA is explicit. Indeed, its remedial process is so specific and

7 (...continued) agency’s construction of a statute that it administers is premised on the theory that a statute’s ambiguity constitutes an implicit delegation from Congress to the agency to fill in the statutory gaps. See Chevron , [467 U.S. at 844]. In extraordinary cases, however, there may be reason to hesitate before concluding that Congress has intended such an implicit delegation. Cf. Breyer, Judicial Review of Questions of Law and Policy , 38 ADMIN
. L. REV
. 363, 370 (1986) (“A court may also ask whether the legal question is an important one. Congress is more likely to have focused upon, and answered, major questions, while leaving interstitial matters to answer themselves in the course of the statute’s daily administration.”).

. . . . As in MCI [ Telecomm. Corp. v. AT&T Co. , 512 U.S. 218 (1994)], we are confident that Congress could not have intended to delegate a decision of such economic and political significance to an agency in so cryptic a fashion. To find that the FDA has the authority to regulate tobacco products, one must not only adopt an extremely strained understanding of “safety” as it is used throughout the Act—a concept central to the FDCA’s regulatory scheme—but also ignore the plain implication of Congress’ subsequent tobacco-specific legislation. It is therefore clear, based on the FDCA’s overall regulatory scheme and the subsequent tobacco legislation, that Congress has directly spoken to the question at issue and precluded the FDA from regulating tobacco products. 529 U.S. at 159–61 (emphasis added). 33detailed as to verge on the mechanical. There’s simply no play in the joints of this scheme that would permit the Secretary to issue gaming procedures outside of the narrow circumstances prescribed by Congress. “Regardless of how serious the problem an administrative agency seeks to address, . . . it may not exercise its authority ‘in a manner that is inconsistent with the administrative structure that Congress enacted into law.’” Brown & Williamson , 529 U.S. at 125 (quoting ETSI Pipeline Project v. Missouri , 484 U.S. 495, 517 (1988)). In IGRA, Congress created an administrative structure thatassigns federal courts—not DOI—primary responsibility for facilitating tribalstate compacts. The statute envisions a role for DOI only after: (1) a tribe sues a state 180 days after it first requested negotiations; (2) a court has made a finding of bad faith on the part of the state; (3) following such a finding, the parties fail to conclude a compact within sixty days, as directed by the court; and (4) after such failure and the court’s appointment of a mediator, the state fails to consent to a mediator-proposed compact within sixty days of its being proposed. See 25 U.S.C. § 2710(d)(7)(B). Furthermore, even where all of these steps have been met, the Secretary’s role is limited: “the Secretary shall prescribe, in consultation with the Indian tribe, procedures . . . which are consistent with the proposed compact selected by the [court-appointed] mediator . . . , the provisions of this chapter, and the relevant provisions of the laws of the State.” 25 U.S.C. § 2710(d)(7)(B)(vii)(I).

34Notably, Congress has narrowly circumscribed the Secretary’s authority in prescribing procedures by cross-referencing previous steps in the judicial remedial process. Accepting DOI’s arguments would sweep away these statutory requirements. To be sure, once the process has reached the point where the Secretary is statutorily authorized to prescribe procedures, there arguably could be more than one permissible reading of the Secretary’s authority—for example, regarding what it means to adopt procedures “consistent with the proposed compact.” Id . But there is no ambiguity as to when the Secretary’s authority is triggered. Part 291 attempts an end run around this clear statutory language by purporting to empower the Secretary to step in without a finding of bad faith if a state asserts sovereign immunity and that assertion results in dismissal of the suit. 25 C.F.R. § 291.3. At bottom, the Secretary is attempting to rewrite IGRA.
In MCI Telecommunications Corp. v. AT&T Co. , the Supreme Court struck down the Federal Communications Commission’s (“FCC”) attempt to fundamentally alter a statutory scheme of regulation, even though Congress had expressly delegated to the FCC broad power to “modify any requirement” of the statutory provision at issue. See 47 U.S.C. § 203(b)(2); 512 U.S. at 234. The Court reasoned that the statute’s “modify” language cannot mean “to change fundamentally,” 512 U.S. at 227, and that the FCC had embarked on “a fundamental revision of the statute, changing it from a [statutorily mandated]

35scheme of rate regulation in long-distance common-carrier communications to a scheme of rate regulation only where effective competition does not exist,” id. at 231–32. The Court struck down this attempted rewrite, characterizing it as“effectively the introduction of a whole new regime of regulation (or of freemarket competition), which may well be a better regime but is not the one that Congress established.” Id. at 234. We find ourselves in a similar place. The remedial scheme adopted by DOI differs from that created by Congress in fundamental ways. First, IGRA requires a finding by a federal court that a state failed to negotiate in good faith, 25 U.S.C. § 2710(d)(7)(A), whereas Part 291 has no such requirement, 25 C.F.R. § 291.3. Furthermore, under the statute, if a tribe and state fail to reach an agreement within sixty days of being ordered to do so by the court, the court must appoint a mediator. 25 U.S.C. § 2710(d)(7)(B)(iv). Under the regulations, on the other hand, the Secretary must appoint a mediator only if a state submits an alternative proposal. 25 C.F.R. § 291.9. These differences are important, but they actually pale in comparison to the outcomes possible under each regime. Irrespective of a state’s good faith in bargaining, Part 291 guarantees to tribes the issuance of procedures for Class III gaming. See Texas , 497 F.3d at 508 (“Under the Secretarial Procedures . . . it matters not that a state undertook good-faith negotiations with the tribe: The Secretary may prescribe Class III gaming irrespective of a state’s good faith.”). “This result contravenes the plain

36language of IGRA,” id. , which allows for the possibility that a state will be able to carry its burden to show good faith, resulting in either a return to the negotiation table or the end of the road for a tribe’s attempt to obtain a compact or procedures permitting gaming. See id. at 494 (“If the court finds the state negotiated in good faith, the tribe’s proposal fails.”). Thus, Part 291 completely upsets IGRA’s “carefully crafted and intricate remedial scheme.” Seminole Tribe , 517 U.S. at 73–74. Indeed, Part 291 is similar to the rule invalidated in MCI in that it fundamentally alters a statutory regulatory scheme. Compare 25 U.S.C. § 2710(d)(7)(B)(ii)–(iii) (requiring additional efforts to negotiate a tribal-state compact only after a judicial determination that the state failed to negotiate in good faith), with 25 C.F.R. §§ 291.7–.9, 291.11 (providing for the issuance of procedures permitting Class III gaming in every instance). Congress has not delegated to the Secretary express authority to make such fundamental alterations to IGRA’s statutory requirements. At best, DOI’s authority to issue the regulations in question rests on its “general authority” under 25 U.S.C. §§ 2, 9, combined with the specific mandates in IGRA itself. See Aplt. DOI’s Opening Br. at 46. In this regard DOI’s position is even weaker than that of the FCC in MCI : DOI has no express authority to “modify any requirement,” 512 U.S. at 225, of the statutory scheme established by Congress in IGRA. The absence of such an express delegation of authority is conspicuous.

37Moreover, “we must be guided to a degree by common sense as to the manner in which Congress is likely to delegate a policy decision of such economic and political magnitude to an administrative agency.” Brown & Williamson Tobacco , 529 U.S. at 133. We are confident that Congress did not intend to implicitly delegate such authority to the Secretary given the “significant governmental interests” of competing sovereigns—including the powerful economic interests involved in the regulation of Class III gaming—that it attempted to balance in IGRA. The balancing of such important interests is not “the kind of highly technical, specialized interstitial matter that Congress often does not decide itself, but delegates to specialized agencies to decide.” Zuni Pub. Sch. Dist. No. 89 v. Dep’t of Educ. , 550 U.S. 81, 90 (2007). Had Congress intended to give such power to the Secretary, we believe that it would have done so in a clear manner; instead, it undertook to balance those interests itself in
IGRA. See Whitman v. Am. Trucking Ass’ns , 531 U.S. 457, 468 (2001) (“Congress, we have held, does not alter the fundamental details of a regulatory scheme in vague terms or ancillary provisions—it does not, one might say, hide elephants in mouseholes.” (citing MCI, 512 U.S. at 231; Brown & Williamson Tobacco , 529 U.S. at 159–60)). We find implausible the Secretary’s assertion of implicit power to create an alternative to the explicit and detailed remedial scheme that IGRA prescribes. On the contrary, IGRA expressly forecloses the procedures adopted by DOI in Part 291.

38b DOI argues that “Congress drew a map in which all roads lead to some kind of gaming procedures.” Aplt. DOI’s Opening Br. at 34. In particular, DOI relies on IGRA’s legislative history, which it characterizes as “clearly establish[ing] that Congress’s foremost goal was to ensure that tribes would have access to gaming procedures, and the specific process it formulated under Section 2710(d)(7) was in aid of that ultimate goal.” Id. at 36. In addressing DOI’s argument, we assume arguendo that an inquiry into legislative history is generally appropriate at Chevronstep one and, more specifically, that it is appropriate even where the statute’s text and structure evince Congress’s intent with crystalline clarity, as here. Compare Vill. of Barrington v. Surface Trans. Bd. , 636 F.3d 650, 666 (D.C. Cir. 2011) (stating, “we would be uncomfortable relying on such legislative history at Chevronstep one”), and Phillips Petroleum Co. v. Lujan , 4 F.3d 858, 861 (10th Cir. 1993) (“The best evidence of Congressional intent is the text of the statute itself and where the language is unambiguous, our inquiry is complete.”), with Cardoza-Fonseca , 480 U.S. at 432 n.12 (1987) (“[T]he plain language of this statute appears to settle the question before us. Therefore, we look to the legislative history to determine only whether there is ‘clearly expressed legislative intention’ contrary to that language, which would require us to question the strong presumption that Congress expresses its intent through the language it chooses.”), and id. at 446 (discussing Chevronand stating that

39“[e]mploying traditional tools of statutory construction, we have concluded that Congress did not intend the two [statutory] standards to be identical”), and Nat. Res. Def. Council, Inc. v. Browner , 57 F.3d 1122, 1127 (D.C. Cir. 1995) (“Where the terms of a statute are unambiguous, further judicial inquiry into the intent of the drafters is generally unnecessary . . . . Reference to statutory design and pertinent legislative history may often shed new light on congressional intent, notwithstanding statutory language that appears ‘ superficially clear .’” (emphases added) (citations omitted) (quotingAm. Scholastic TV Programming Found. v.
FCC , 46 F.3d 1173, 1180 (D.C. Cir. 1995)). However, having examined the legislative history, we conclude that it actually undermines DOI’s position. Significantly, DOI is unable to cite to any evidence from the legislative history that substantiates its claim that Congress intended for IGRA’s negotiations process to invariably result in the issuance of Class III gaming procedures. DOI concedes that IGRA attempts to balance the competing interests of states and tribes “on the basis of ‘equal sovereign[ty]’ between” them. Aplt. DOI’s Opening Br. at 36 (alteration in original) (quoting S. Rep. No. 100-446, at 13 (1988), as reprinted in 1988 U.S.C.C.A.N. at 3083). In this regard, recognizing “the need to provide some incentive for States to negotiate with tribes in good faith,” Congress chose “as the least offensive option, to grant tribes the right to sue a State if a compact is not negotiated and chose to apply the good faith standard.” S. Rep. No. 100-446, at 13–14 (1988), as reprinted in 1988 U.S.C.C.A.N. at 3084. This

40system of voluntary negotiation, fortified by the states’ duty to bargain in good faith, aims to strike an appropriate balance between equal sovereigns. Equal bargaining cannot be had, however, where the parties know that, absent an agreement, one side will nevertheless obtain its fundamental goals; yet, this is precisely the situation that the Part 291 regulations prescribe, where ultimately the tribe will secure gaming procedures. Such an arrangement fundamentally alters the bargaining power of the parties and undoes Congress’s delicate balancing of the competing state and tribal interests at stake—making Part 291 a far cry from the “least offensive option.”

c In IGRA, Congress effectively asserted that “in the final analysis, it is the responsibility of the Congress, consistent with its plenary power over Indian affairs, to balance competing policy interests and to adjust, where appropriate, the jurisdictional framework for regulation of gaming on Indian lands.” S. Rep. No. 100-446, at 3 (1988), as reprinted in 1988 U.S.C.C.A.N. at 3072. In light of our reading of IGRA’s statutory text, structure, and history—fortified by our common-sense assessment of the importance of the sovereign and economic interests at stake—we hold that Congress has spoken in IGRA to the specific issue addressed by the Part 291 regulations, and it has thus effectively foreclosed DOI’s attempt to craft a parallel remedial scheme.

413 DOI offers two arguments that attempt to inject ambiguity into IGRA’s otherwise unambiguous text. First, DOI argues that “[c]ourts that have examined potential conflicts within a statute, including conflicts between statutory language and Congress’s unambiguously expressed purpose, have held that those conflicts demonstrate an ambiguity that requires agency interpretation.” Aplt. DOI’s Opening Br. at 38. But the cases that DOI cites do not support this assertion. Scialabba v. Cuellar de Osorio , --- U.S. ----, 134 S. Ct. 2191 (2014), dealt, not with tension between statutory purpose and text, but rather with the tension between the text of two parts of the same provision. Id. at 2203 (“And § 1153(h)(3) does not speak unambiguously to the issue here—or more preciselyput, it addresses that issue in divergent ways. We might call the provision Janusfaced. Its first half looks in one direction, toward the sweeping relief the respondents propose . . . . But . . . the section’s second half looks another way, toward a remedy that can apply to only a subset of those beneficiaries . . . .”). Similar textual situations are present in the other cases DOI cites. See Nat’l Ass’n of Home Builders v. Defs. of Wildlife , 551 U.S. 644, 647 (2007) (finding ambiguity because the EPA could not “simultaneously obey the differing mandates of [Endangered Species Act] § 7(a)(2) and [Clean Water Act] § 402(b)”); Lorenzo v. Mukasey , 508 F.3d 1278, 1283 (10th Cir. 2007) (addressing conflict between two provisions of the Immigration and

42Naturalization Act). DOI’s citation to Brown & Williamson Tobacco ’s recitation of the familiar canon that statutory language should be read in context fails to establish that tensions between statutory text and perceived legislative purpose create interpretive space for an agency to fill. Further, as explained supra , DOI is mistaken in asserting that, in IGRA, Congress intended for the process to always result in permitting Class III gaming—IGRA’s text and history do not bear that

out. Second, DOI argues “that a subsequent court decision can reveal ambiguity in a statute.” Aplt. DOI’s Opening Br. at 40. In support of this position, DOI cites three cases from our sister circuits. All of these cases involved the Commissioner of Social Security’s administration of the Coal Act, 26 U.S.C. § 9701 et seq. —less commonly known as the Coal Industry Retiree Health Benefit Act—a regulatory scheme designed in part “to identify the coal operators most responsible for benefit plan liabilities and to enlist them to provide benefits to retirees” who might otherwise not receive benefits. See, e.g. , Pittston Co. v. United States , 368 F.3d 385, 390–92 (4th Cir. 2004). The Coal Act did so by requiring the Commissioner to assign retirees to an operator remaining in business and signatory to a relevant coal wage agreement. See 26 U.S.C. § 9706(a). Three such categories of operators were enumerated, with the second serving as a fallback in case no operator fell under the first category with respect to that

43retiree, and the third category serving as a fallback in case the retiree could not be assigned under the first or second categories. Id.
In Eastern Enterprises v. Apfel , 524 U.S. 498 (1998), however, the Supreme Court struck down the application of the third category to certain operators, based on the severe retroactive liability imposed on them. Id. at 536–37. In response, the Commissioner made assignments under the third category to a more limited universe of employers, resulting in a greater number of assignments and therefore an increase in pension liability to some operators. E.g. , Pittston Co. , 368 F.3d at 401–02. Three circuits—the Fourth, Sixth, and Eleventh—upheld this administrative action. U.S. Steel Corp. v. Astrue , 495 F.3d 1272, 1288–89 (11th Cir. 2007); Sidney Coal Co. v. Soc. Sec. Admin. , 427 F.3d 336 (6th Cir. 2005); Pittston Co. , 368 F.3d at 403. The theory relied on in these cases, and by DOI here, is that cases such as Eastern Enterprises and Seminole Tribe reveal ambiguity latent in a statute from the date of its enactment, as courts do not create but rather find the law, and Congress’s action contrary to the Constitution is a nullity. See Texas , 497 F.3d at 515–16 (Dennis, J., dissenting) (analyzing these cases and stating, “The Supreme Court does not create law, it discovers it—and the Supreme Court did not create the gap in this case, but merely declared its existence. Congress itself created the gap or ambiguity by mistakenly overestimating its powers and passing a statute that could not be constitutionally applied as Congress intended.”); Aplt. DOI’s

44Opening Br. at 40–44. As this argument goes, in passing a regulatory regime unconstitutional in part, Congress has implicitly left a gap that the agency charged with the statute’s administration can fill. As an initial matter, we agree with the opinion of Chief Judge Jones in Texasthat the extracircuit cases that DOI cites are distinguishable from this case. The Court’s decision in Eastern Enterprisesdid not completely strike down the third Coal Act category but merely narrowed it and the administrator attempted to carry out the statutory command in light of the Court’s holding, rather than circumventing the Coal Act. See Texas , 497 F.3d at 505 n.13. But we discern an even more fundamental reason to reject DOI’s argument; it confuses unconstitutionality with ambiguity. The Supreme Court has consistently described Chevron as creating a presumption that Congress intends statutory ambiguity to be resolved by the agency entrusted with a statutes’ administration: Chevron is rooted in a background presumption of congressional intent: namely, “that Congress, when it left ambiguity in a statute” administered by an agency, “understood that the ambiguity would be resolved, first and foremost, by the agency, and desired the agency (rather than the courts) to possess whatever degree of discretion the ambiguity allows.” Chevron thus provides a stable background rule against which Congress can legislate: Statutory ambiguities will be resolved, within the bounds of reasonable interpretation, not by the courts but by the administering agency. Congress knows to speak in plain terms when it wishes to circumscribe, and in capacious terms when it wishes to enlarge, agency discretion.

45City of Arlington v. FCC , --- U.S. ----, 133 S. Ct. 1863, 1868 (2013) (citations omitted). As this language from City of Arlington suggests, Chevron deference is tied to statutory interpretation and statutory text, and thereby to congressional intent as filtered through the requirements of bicameralism and presentment. Thus, we are required to apply Chevrondeference to a permissible agency interpretation of a statute that is silent or ambiguous on the specific question at issue. Chevron does not, however, contemplate that a judicial decision, like Seminole Tribe , could turn a clear, unambiguous statute into an ambiguous one, by declaring a portion of it unconstitutional. The Supreme Court has never held that, in crafting a partially unconstitutional regulatory regime, Congress has necessarily delegated to the relevant administrative agency the power to fundamentally revise that regime in order to work around an area that had been declared unconstitutional. Such a background presumption as DOI urges would turn our constitutional order on its head. As one of our former colleagues has pithily stated, “When the political branches disagree with a judicial interpretation of existing law, the Constitution prescribes the appropriate remedial process. It’s called legislation.” Gutierrez-Brizuela v. Lynch , 834 F.3d 1142, 1151 (10th Cir. 2016) (Gorsuch, J., concurring). As applied here, this proposition means to us

46that the power to remedy the defects in IGRA’s remedial scheme lies notwith DOI, but with Congress. 8 Thus, the unconstitutionality of IGRA’s jurisdiction-granting provision does not render the enactment any less clear than the text was when Congress passed it and the President signed it. And, as demonstrated above, Congress has spoken clearly in IGRA regarding the circumstances in which the Secretary can issue Class III gaming procedures to a tribe that has not entered into a compact with a state. “Congress knows to speak in plain terms when it wishes to circumscribe, and in capacious terms when it wishes to enlarge, agency discretion.” City of Arlington , 133 S. Ct. 1868. In IGRA, Congress spoke in plain rather than capacious terms. That it mistook the extent of its power under the Constitution does not thereby evince an agency delegation. The unconstitutionality of a provision does not make the language of IGRA more or less plain or capacious. While executive agencies may well wield “[t]he power of

8 In its reply brief, DOI underscores that “[t]he ambiguity lies in Section 2710(d)(7)(B)(vii), which authorizes the Secretary to prescribe gaming procedures for a tribe.” Reply Br. at 14. DOI contends that, although IGRA authorizes it to prescribe procedures when, as here, the State has not consented to the proposed compact, and constrains how it should do so, by obliging it to seek to be consistent with the proposed compact drawn up by the court-appointed mediator, “Congress simply failed to specify how the Secretary must exercise her authority in the absence of a mediator.” Id. at 14–15. In this regard, DOI notes that it is a state’s act of invoking sovereign immunity in a tribe’s IGRA lawsuit that causes “the IGRA process [to be] cut short before a mediator is appointed.” Id. at 14. We are not given pause by DOI’s contention. It is simply another way of asserting that Seminole Tribe , by allowing the states to successfully invoke sovereign immunity, has created an ambiguity in IGRA—a position that we reject here. 47executing the laws,” which “necessarily includes both authority and responsibility to resolve some questions left open by Congress that arise during the law’s administration” that emphatically “does not include a power to revise clear statutory terms that turn out not to work in practice.” Util. Air Regulatory Grp. v.
EPA , --- U.S. ----, 134 S. Ct. 2427, 2446 (2014). Part 291 is just such an attempt at statutory revision by administrative rulemaking.

*************** In sum, we hold that IGRA unambiguously forecloses the Part 291 regulations. Accordingly, we do not proceed to Chevron step two. The Part 291 regulations are invalid and unenforceable.
D Lastly, we turn to the primary argument asserted in the Pojoaque’s brief—namely, that the Supreme Court’s decision in Seminole Tribe requires us to strike down additional provisions of IGRA under a severability analysis. In Seminole Tribe , the Supreme Court expressly declined to consider the extent to which the portion of the statute concerning Class III gaming procedures remained intact following its holding that Congress lacked authority to make states subject to suits brought by tribes under 25 U.S.C. § 2710(d)(7). See 517 U.S. at 76 n.18 (“We do not here consider, and express no opinion upon, that portion of the decision below that provides a substitute remedy for a tribe bringing suit.” (citing Seminole Tribe of Fla. v. Florida , 11 F.3d 1016, 1029 (11th Cir. 1994) (“The final

48question we must resolve is whether all provisions for state involvement in [C]lass III gaming also fail, as the tribes contend. We hold that they do not.”))). The Pojoaque argue that we should now take up this issue and strike down other provisions of IGRA because the jurisdiction-granting clause at issue in Seminole Tribe is not severable. We first address New Mexico’s objections to our reaching the merits of the Tribe’s contentions. New Mexico argues that, in the district court, the Pojoaque “agree[d] to limit its proposed argument for summary judgment to the narrow legal question of whether the [DOI] had authority to promulgate the [Part 291 regulations],” and the court granted the Tribe permissive intervention on the condition that it honor that agreement. Aplee.’s Supp. App. at 71; see Aplee.’s Br. at 69; see also 7C
C HARLES A LAN W RIGHT & A RTHUR R. M ILLER , F EDERAL P RACTICE AND P ROCEDURE § 1922 (3d ed. 1998) (“Since the trial court has full discretion to grant or deny an application for permissive intervention under Rule 24(b), it may if it chooses impose conditions on its grant of the application.” (footnote omitted)). Second, New Mexico argues that its complaint focused exclusively on the validity of the Part 291 regulations and that neither DOI nor the Pojoaque filed or sought to file a responsive pleading to inject into this action a severability challenge to the balance of IGRA’s provisions. Therefore, New Mexico reasons that this challenge is not properly before us.

49Neither of these arguments is ultimately persuasive. We address them in turn. Regarding the district court’s limitation of the Pojoaque’s arguments for purposes of the summary judgment briefing below, the context shows that the court was focused on barring the Tribe from raising the question of whether New Mexico had negotiated in good faith—an issue the Tribe wished to litigate. See Aplee.’s Supp. App. at 71–72. That understanding of the limitation imposed is reflected in the district court’s decision to undertake an analysis of the severability issue in its order. See Aplts.’ App. at 64–66. Nor does it appear from New Mexico’s briefing or the appendices filed with this court that New Mexico objected on the ground of this limitation to the Pojoaque’s injection of the severability issue into the district court litigation. As to the argument that the Pojoaque are limited to litigating the issues raised in the pleadings, a similar failure to object decides the issue. Federal Rule of Civil Procedure 15(b) permits amendment during or after trial to conform to the evidence via two mechanisms. First, an issue may be tried by express or implied consent, if no objection is made. See Green Country Food Mkt., Inc. v. Bottling Grp., LLC , 371 F.3d 1275, 1280 (10th Cir. 2004). When the opposing party fails to object, or itself introduces evidence on the issue (except for evidence relevant to an issue already in the case), then it has impliedly consented to amendment. Id. Second, if the opposing party objects, Rule 15(b) requires the party wishing to inject the new issue to move to amend the pleading; if that party

50does so, then the court should liberally grant amendment unless the opposing party makes a sufficient showing of prejudice. See id. at 1280–81. Although Rule 15(b) contemplates that this process will occur at trial, we have recognized such “constructive amendment” may also take place at the summary judgment stage. See Ahmad v. Furlong , 435 F.3d 1196, 1202–04 (10th Cir. 2006) (holding that district court erred by precluding defendant from constructively amending through briefing on summary judgment to add an affirmative defense); see McBeth v. Himes , 598 F.3d 708, 716 (10th Cir. 2010) (holding that First Amendment retaliation claim not in plaintiff’s complaint or summary judgment briefing but addressed by district court was properly before us because defendant did not object or argue that he was prejudiced and plaintiff had raised a Sixth Amendment retaliation claim in her summary judgment briefing); cf. Green Country Food Mkt. , 371 F.3d at 1280–81 (affirming district court’s refusal under Rule 15(b) to consider an issue not presented in complaint and raised only in summary judgment briefing, but only because opposing party objected and plaintiff did not move to amend). These cases control. Here, there is no evidence that the State objected to the Tribe’s injection of this issue into the litigation, nor was any argument presented to the district court or this court that the State was thereby prejudiced. Indeed, inspection of the district court’s docket shows that the State affirmatively engaged the issue in their summary judgment briefing. See Opposition to Federal and Intervenor

51Defendants’ Motions for Summary Judgment at 22–23, New Mexico v. Dep’t of the Interior , No. 14-cv-695-JAP/SCY (D.N.M. Oct. 6, 2014), ECF No. 41. 9 Because the State failed to object below or argue that it was prejudiced by having to address the Tribe’s severability argument, the district court did not abuse its discretion by considering the argument, and we proceed to the merits of it now. Generally, “[a] court should refrain from invalidating more of the statute than is necessary.” Alaska Airlines, Inc. v. Brock , 480 U.S. 678, 684 (1987). When one provision of an enactment is struck down, “[u]nless it is evident that the Legislature would not have enacted those provisions which are within its power, independently of that which is not, the invalid part may be dropped if what is left is fully operative as a law.” Id. (quoting Buckley v. Valeo , 424 U.S. 1, 108 (1976) (per curiam)); see also Nat’l Fed’n of Indep. Bus. v. Sebelius (NFIB) , 567 U.S. 519, 132 S. Ct. 2566, 2607 (2012) (“[W]e seek to determine what Congress would have intended in light of the Court’s constitutional holding.” (quoting United States v. Booker , 543 U.S. 220, 246 (2005))). In the past, this court has always applied this standard. 10 See Kikumura v. Hurley , 242 F.3d 950, 959–60

9 See, e.g. , Milligan-Hitt v. Bd. of Trs. of Sheridan Cty. Sch. Dist. No. 2 , 523 F.3d 1219, 1231 (10th Cir. 2008) (“The record on appeal comprises all of ‘the original papers and exhibits filed in the district court; . . . the transcript of proceedings if any; . . . and a certified copy of the docket entries prepared by the district clerk.” . . . We sometimes refer to this appendix colloquially as the record on appeal, but technically it is not.” (footnote and citations omitted) (quoting Fed. R. App. P. 10(a)).

10 The Tribe argues that Alaska Airlines creates a two-prong test where we (continued...) 52(10th Cir. 2001); Cache Valley Elec. Co. v. Utah Dep’t of Transp. , 149 F.3d 1119, 1123 (10th Cir. 1998). The Supreme Court has sometimes framed this inquiry as “[w]ould the legislature have preferred what is left of its statute to no statute at all?” Ayotte v. Planned Parenthood of N. New Eng. , 546 U.S. 320, 330 (2006); see also Booker , 543 U.S. at 249 (“We then compare our own remedy to the total invalidation of the statute, and conclude that Congress would have preferred our remedy.”).

10(...continued) must ask both whether the statute will operate consistently with congressional intent and whether Congress would have adopted the statute without the unconstitutional provision. Aplt. Pueblo of Pojoaque’s Opening Br. at 10–12. Its authority for this assertion is primarily NFIB ’s dissent. See id. at 10 (citing NFIB , 132 S. Ct. 2566 (Scalia, J., dissenting)). The dissent argued that this statutory functionality inquiry was the first step in a “two-part guide as the framework for severability analysis.” Id. at 2668. At the same time, however, Justice Scalia implied that often the functionality inquiry is simply a proxy for the legislative intent inquiry. See id. at 2669 (“In the ordinary course, if the remaining provisions cannot operate according to the congressional design, (the first inquiry), it almost necessarily follows that Congress would not have enacted them (the second inquiry). This close interaction may explain why the Court has not always been precise in distinguishing between the two. There are, however, occasions in which the severability standard’s first inquiry (statutory functionality) is not a proxy for the second inquiry (whether the Legislature intended the remaining provisions to stand alone).”). Justice Scalia, together with the other dissenters, would have relied on the independence of the first inquiry to hold that the rest of the ACA must fall along with the individual mandate and the provision cutting off Medicaid funds to states that chose not to adopt the expansion. See id. at 2671–77. As far as we can tell, however, the Court has never held squarely that the statutory functionality inquiry is independent of the legislative intent question, though it has on occasion employed it. See Alaska Airlines , 480 U.S. at 685; cf. Free Enter. Fund v. Pub. Co. Accounting Oversight Bd. (PCAOB) , 561 U.S. 477, 509 (2010) (“The Sarbanes-Oxley Act remains ‘fully operative as a law’ with these tenure restrictions excised.” (quoting New York v. United States , 505 U.S. 144, 186 (1992))). Thus, we do not consider the statutory functionality inquiry as separate from the “touchstone” criterion of legislative intent. NFIB , 132 S. Ct. at 2607 (Roberts, C.J.); accord Ayotte , 546 U.S. at 330. 53Additionally, it is well-established that “[t]he inquiry is eased when Congress has explicitly provided for severance by including a severability clause in the statute.” Alaska Airlines , 480 U.S. at 686. A severability clause “creates a presumption that Congress did not intend the validity of the statute in question to depend on the validity of the constitutionally offensive provision.” Id. This presumption can be overcome only by “strong evidence”: “[U]nless there is strong evidence that Congress intended otherwise, the objectionable provision can be excised from the remainder of the statute.” Id. IGRA includes a severability clause. See 25 U.S.C. § 2721. As a preliminary matter, the Tribe asks that, if we find that Congress would not have passed IGRA in the absence of the ability to subject states to suits brought by tribes, we should engage in an elaborate editing of IGRA such that the Part 291 regulations could be upheld. See Aplt. Pueblo of Pojoaque’s Opening Br. at 25–27 (offering an edited version of IGRA’s remedial provisions). Just as we have held that it is not the place of the executive branch to rewrite legislative enactments, so too it is ordinarily not the task of the judiciary to rewrite a statute.
See PCAOB , 561 U.S. at 509–10 (“In theory, perhaps, the Court might blue-pencil a sufficient number of the Board’s responsibilities so that its members would no longer be ‘Officers of the United States.’ Or we could restrict the Board’s enforcement powers, so that it would be a purely recommendatory panel. Or the Board members could in future be made removable by the President, for good

54cause or at will. But such editorial freedom—far more extensive than our holding today—belongs to the Legislature, not the Judiciary.”); Ayotte , 546 U.S. at 329 (“[M]indful that our constitutional mandate and institutional competence are limited, we restrain ourselves from ‘rewrit[ing] state law to conform it to constitutional requirements’ even as we strive to salvage it.” (alteration in original) (quoting Virginia v. Am. Booksellers Ass’n., Inc. , 484 U.S. 383, 397 (1988))). We will not engage in such judicial editing of a statute. IGRA’s jurisdiction-granting clause falls alone or it falls with all of IGRA. We turn to whether strong evidence shows that Congress would not have passed IGRA without that clause, looking to whether Congress would prefer no IGRA to its current state and whether, in its current state, it is capable of operating consistently with Congress’s intent. As should be clear from our description, supra , of IGRA’s remedial scheme, the provision permitting tribes to hale states into court is important. Congress had difficulty finding a proper incentive to bring states to the negotiation table. See S. Rep. No. 100-446, at 13 (1988), as reprinted in 1988 U.S.C.C.A.N. at 3083 (“The practical problem in formulating statutory language to accomplish the desired result is the need to provide some incentive for States to negotiate with tribes in good faith because tribes will be unable to enter into such gaming unless a compact is in place. That incentive for the states has proved elusive.”). Congress considered a judicially enforced duty of good-faith

55negotiation as the “least offensive option,” which would “best . . . encourage States to deal fairly with tribes as sovereign governments.” Id. at 14, as reprinted
in 1988 U.S.C.C.A.N. at 3084. Absent this mechanism, recalcitrant states need not fear being forced into a compact, and tribes, having lost their best alternative to a negotiated agreement, have seen their bargaining position diminished. However, as even the Pojoaque must concede, Seminole Tribe does not so completely stymie Congress’s intent in IGRA. 11 The Pojoaque concede at least three situations in which IGRA could function largely as intended. See Aplt. Pueblo of Pojoaque’s Opening Br. at 35; Aplt. Pueblo of Pojoaque’s Reply Br. at 22. First, at least one state, California, has categorically waived by statute its sovereign immunity as to IGRA claims.
See Rincon Band of Luiseno Mission Indians v. Schwarzenegger , 602 F.3d 1019, 1026 (9th Cir. 2010). Second, a state may simply choose not to raise an otherwise available sovereign-immunity defense, as the Pojoaque concede

11 The Tribe urges us to consider as evidence statements by Senator Inouye made after the passage of IGRA. See Aplt. Pueblo of Pojoaque’s Opening Br. at 19–20. We decline to consider these statements, for two reasons. First, we have recently been reminded that “statements by individual legislators rank among the least illuminating forms of legislative history.” NLRB v. SW Gen., Inc. , --- U.S. ----, 137 S. Ct. 929, 943 (2017). Further, and dispositive for this question, the Supreme Court has held that “[p]ost-enactment legislative history (a contradiction in terms) is not a legitimate tool of statutory interpretation. Real (pre-enactment) legislative history is persuasive to some because it is thought to shed light on what legislators understood an ambiguous statutory text to mean when they voted to enact it into law. But post-enactment legislative history by definition ‘could have had no effect on the congressional vote.’” Brausewitz v. Wyeth LLC, 562 U.S. 223, 242 (2011) (citations omitted) (quoting District of Columbia v. Heller, 554 U.S. 570, 605 (2008). 56occurred in Northern Arapaho v. Wyoming , 389 F.3d 1308, 1313 (10th Cir. 2004) (reaching and deciding the merits of whether the state negotiated in good faith). Third, the United States may sue on behalf of a tribe in its role as trustee, sidestepping the sovereign immunity defense. See United States v. Spokane Tribe of Indians , 139 F.3d 1297, 1301 (9th Cir. 1998); see also Arizona v. California , 460 U.S. 605, 614 (1983) (permitting intervention by Indian tribes against states where the United States had already intervened on the tribes’ behalf against the states and recalling that “[n]othing in the Eleventh Amendment ‘has ever been seriously supposed to prevent a state’s being sued by the United States’” (quoting United States v. Mississippi , 380 U.S. 128, 140 (1965))). The Pojoaque concede that this third possibility “may indeed save the statute.” Aplt. Pueblo of Pojoaque’s Reply Br. at 22. And tribes may even be able to sue the United States to compel it to bring meritorious IGRA suits against states. See Spokane Tribe , 139 F.3d at 1301 n.5 (citing Chemehuevi Indian Tribe v. Wilson , 987 F. Supp. 804 (N.D. Cal. 1997)). Thus, it appears that IGRA remains capable of functioning largely as Congress intended it to. Despite conceding that the United States’ ability to bring IGRA suits against the states “may indeed save the statute,” the Tribe argues that “allowing for the Part 291 regulation under severance analysis more closely tracks Congress’[s] intent.” Aplt. Pueblo of Pojoaque’s Reply Br. at 22. But this argument depends on (1) the selective editing of the statute that we have already

57rejected, and (2) an understanding of IGRA’s purpose and text that we have also rejected. The Tribe also argues that this just isn’t the manner in which “Congress intended for states to be burdened.” Id. That isn’t clear, insofar as “[w]e assume that Congress knows the law and legislates in light of federal court precedent.” In re Antrobus , 519 F.3d 1123, 1125 (10th Cir. 2008) (quoting Bd. of Cty. Comm’rs
v. EEOC , 405 F.3d 840, 845 (10th Cir. 2005)). We can safely assume that Congress understood that it was also possible for the United States to bring an IGRA claim on a tribe’s behalf. Ultimately, the severability question is a close one. On one side, the centrality of the ability of tribes to sue states weighs against severability. On the other, IGRA may nonetheless function largely as intended, cutting in favor of severability. Here, the presumption established by the severability clause is important. In light of Congress’s express inclusion of a severability clause and the ways in which IGRA may continue to function largely as intended, we hold that the jurisdiction-granting provision is severable from the rest of IGRA. We cannot say that it is clear that Congress would prefer no legislation to IGRA as it stands after Seminole Tribe . We decline to strike down the rest of IGRA.
III For the foregoing reasons, we AFFIRM the district court’s judgment.

58