What follows is an opinion from the Supreme Court of the United States. Your task is to identify the reason, if any, given by the court for granting the petition for certiorari.

Opinion:
Fane LOZMAN, Petitioner
v.
CITY OF RIVIERA BEACH, FLORIDA.
No. 17-21.
Supreme Court of the United States
Argued Feb. 27, 2018.
Decided June 18, 2018.
Pamela S. Karlan, Stanford, CA, for Petitioner.
Shay Dvoretzky, Washington, D.C., for Respondent.
Jeffrey B. Wall, Washington, D.C., for the United States as amicus curiae, by special leave of the Court, supporting the respondent.
Kerri L. Barsh, Greenberg Traurig, Miami, FL, Pamela S. Karlan, Jeffrey L. Fisher, David T. Goldberg, Stanford Law School, Supreme Court Litigation Clinic, Stanford, CA, for Petitioner.
Benjamin M. Flowers, Jones Day, Columbus, OH, Shay Dvoretzky, Jeffrey R. Johnson, Vivek Suri, Jones Day, Washington, D.C., Benjamin L. Bedard, Stephanie W. Kaufer, Roberts, Reynolds, Bedard & Tuzzio, PLLC, Andrew DeGraffenreidt III, City Attorney, Lina Busby, Assistant City Attorney, City of Riviera Beach, Riviera Beach, FL, for Respondent.
Justice KENNEDY delivered the opinion of the Court.
This case requires the Court to address the intersection of principles that define when arrests are lawful and principles that prohibit the government from retaliating against a person for having exercised the right to free speech. An arrest deprives a person of essential liberties, but if there is probable cause to believe the person has committed a criminal offense there is often no recourse for the deprivation. See, e.g., Devenpeck v. Alford, 543 U.S. 146, 153, 125 S.Ct. 588, 160 L.Ed.2d 537 (2004). At the same time, the First Amendment prohibits government officials from retaliating against individuals for engaging in protected speech. Crawford-El v. Britton, 523 U.S. 574, 592, 118 S.Ct. 1584, 140 L.Ed.2d 759 (1998).
The petitioner in this case alleges that high-level city policymakers adopted a plan to retaliate against him for protected speech and then ordered his arrest when he attempted to make remarks during the public-comment portion of a city council meeting. The petitioner now concedes there was probable cause for the arrest. The question is whether the presence of probable cause bars petitioner's retaliatory arrest claim under these circumstances.
I
The city of Riviera Beach is on the Atlantic coast of Florida, about 75 miles north of Miami. The petitioner here is Fane Lozman. In 2006 Lozman towed his floating home into a slip in the City-owned marina, where he became a resident. Thus began his contentious relationship with the City's elected officials.
Soon after his arrival Lozman became an outspoken critic of the City's plan to use its eminent domain power to seize homes along the waterfront for private development. Lozman often spoke during the public-comment period at city council meetings and criticized councilmembers, the mayor, and other public employees. He also filed a lawsuit alleging that the Council's approval of an agreement with developers violated Florida's open-meetings laws.
In June 2006 the Council held a closed-door session, in part to discuss the open-meetings lawsuit that Lozman recently had filed. According to the transcript of the meeting, Councilmember Elizabeth Wade suggested that the City use its resources to "intimidate" Lozman and others who had filed lawsuits against the City. App. 176. Later in the meeting a different councilmember asked whether there was "a consensus of what Ms. Wade is saying," and others responded in the affirmative. Id ., at 181-182. Lozman alleges that these remarks formed an official plan to intimidate him. The City, on the other hand, maintains that the only consensus reached during the meeting was to invest the money and resources necessary to prevail in the litigation against it.
In all events, Lozman became embroiled in a number of disputes with city officials and employees over the ensuing years, many of which Lozman says were part of the City's plan of retaliation. The dispute that led to this litigation took place in 2006. In November of that year, five months after the closed-door meeting where the "intimidate" comment was made, the City Council held a public meeting. The agenda included a public-comment session in which citizens could address the Council for a few minutes. As he had done on earlier occasions and would do more than 200 times over the coming years, see Tr. in No. 9:08-cv-80134 (SD Fla.), Doc. 785, p. 61, Lozman stepped up to the podium to give remarks. He began to discuss the recent arrest of a former county official. Councilmember Wade interrupted Lozman, directing him to stop making those remarks. Lozman continued speaking, this time about the arrest of a former official from the city of West Palm Beach. Wade then called for the assistance of the police officer in attendance. The officer approached Lozman and asked him to leave the podium. Lozman refused. So Wade told the officer to "carry him out." The officer handcuffed Lozman and ushered him out of the meeting. The incident was recorded on video. See Record, Def. Exh. 505, Doc. 687, available at https://www.supremecourt.gov/media/video/mp4files/Lozman_v_RivieraBeach.mp4. According to the City, Lozman was arrested because he violated the City Council's rules of procedure by discussing issues unrelated to the City and then refused to leave the podium. According to Lozman, the arrest was to retaliate for his open-meetings lawsuit against the City and his prior public criticisms of city officials.
Under arrest, Lozman was escorted to police headquarters. He was charged with disorderly conduct and resisting arrest without violence and then released. Later, the State's attorney determined there was probable cause to arrest Lozman for those offenses but decided to dismiss the charges.
Lozman filed this lawsuit under Rev. Stat. § 1979, 42 U.S.C. § 1983. The complaint described a number of alleged incidents that, under Lozman's theory, showed the City's purpose to harass him in different ways. These ranged from a city employee telling Lozman that his dog needed a muzzle to the City's initiation of an admiralty lawsuit against Lozman's floating home-the latter resulting in an earlier decision by this Court. See Lozman v. Riviera Beach, 568 U.S. 115, 133 S.Ct. 735, 184 L.Ed.2d 604 (2013). The evidence and arguments presented by both parties with respect to all the matters alleged in Lozman's suit consumed 19 days of trial before a jury. The jury returned a verdict for the City on all of the claims.
Before this Court, Lozman seeks a reversal only as to the City's alleged retaliatory arrest at the November 2006 city council meeting. The District Court instructed the jury that, for Lozman to prevail on this claim, he had to prove that the arresting officer was himself motivated by impermissible animus against Lozman's protected speech and that the officer lacked probable cause to make the arrest. The District Court determined that the evidence was insufficient as a matter of law to support probable cause for the offenses charged at the time of the arrest (disorderly conduct and resisting arrest without violence). But the District Court concluded that there may have been probable cause to arrest Lozman for violating a Florida statute that prohibits interruptions or disturbances in schools, churches, or other public assemblies. Fla. Stat. § 871.01 (2017). (The City had brought this statute to the District Court's attention during the course of the litigation.) The District Court allowed the jury to decide whether there was probable cause to arrest for the public-disturbance offense.
Judgment having been entered for the City after the jury's verdict, Lozman appealed. The Court of Appeals for the Eleventh Circuit affirmed. 681 Fed.Appx. 746 (2017). As relevant here, the Court of Appeals assumed that the District Court erred when it instructed the jury that the officer, rather than the City, must have harbored the retaliatory animus. But the Court of Appeals held that any error was harmless because the jury necessarily determined that the arrest was supported by probable cause when it found for the City on some of Lozman's other claims-specifically, his claims that the arrest violated the Fourth Amendment and state law. Id., at 751-752. And, under precedents which the Court of Appeals deemed controlling, the existence of probable cause defeated a First Amendment claim for retaliatory arrest. See id., at 752 (citing Dahl v. Holley, 312 F.3d 1228, 1236 (C.A.11 2002) ).
This Court granted certiorari, 538 U.S. ----, 138 S.Ct. 447, 199 L.Ed.2d 328 (2017), on the issue whether the existence of probable cause defeats a First Amendment claim for retaliatory arrest under § 1983. The Court considered this issue once before, see Reichle v. Howards, 566 U.S. 658, 663, 132 S.Ct. 2088, 182 L.Ed.2d 985 (2012), but resolved the case on different grounds.
II
The issue before the Court is a narrow one. In this Court Lozman does not challenge the constitutionality of Florida's statute criminalizing disturbances at public assemblies. He does not argue that the statute is overly broad, e.g., Terminiello v. Chicago, 337 U.S. 1, 69 S.Ct. 894, 93 L.Ed. 1131 (1949) ; Watchtower Bible & Tract Soc. of N. Y., Inc. v. Village of Stratton, 536 U.S. 150, 122 S.Ct. 2080, 153 L.Ed.2d 205 (2002) ; or that it impermissibly targets speech based on its content or viewpoint, e.g., Texas v. Johnson, 491 U.S. 397, 109 S.Ct. 2533, 105 L.Ed.2d 342 (1989) ; Cohen v. California, 403 U.S. 15, 91 S.Ct. 1780, 29 L.Ed.2d 284 (1971) ; or that it was enforced in a way that curtailed Lozman's right to peaceful assembly, e.g., Brown v. Louisiana, 383 U.S. 131, 86 S.Ct. 719, 15 L.Ed.2d 637 (1966). Lozman, furthermore, does not challenge the validity of the City Council's asserted limitations on the subjects speakers may discuss during the public-comment portion of city council meetings (although he continues to dispute whether those limitations in fact existed).
Instead Lozman challenges only the lawfulness of his arrest, and even that challenge is a limited one. There is no contention that the City ordered Lozman's arrest to discriminate against him based on protected classifications, or that the City denied Lozman his equal protection rights by placing him in a "class of one." See Village of Willowbrook v. Olech, 528 U.S. 562, 120 S.Ct. 1073, 145 L.Ed.2d 1060 (2000) (per curiam ). Lozman, moreover, now concedes that there was probable cause for the arrest. Although Lozman does not indicate what facts he believes support this concession, it appears that the existence of probable cause must be based on the assumption that Lozman failed to depart the podium after receiving a lawful order to leave.
Lozman's claim is that, notwithstanding the presence of probable cause, his arrest at the city council meeting violated the First Amendment because the arrest was ordered in retaliation for his earlier, protected speech: his open-meetings lawsuit and his prior public criticisms of city officials. The question this Court is asked to consider is whether the existence of probable cause bars that First Amendment retaliation claim.
III
It is well established that in a § 1983 case a city or other local governmental entity cannot be subject to liability at all unless the harm was caused in the implementation of "official municipal policy." Monell v. New York City Dept. of Social Servs., 436 U.S. 658, 691, 98 S.Ct. 2018, 56 L.Ed.2d 611 (1978) ; see Los Angeles County v. Humphries, 562 U.S. 29, 36, 131 S.Ct. 447, 178 L.Ed.2d 460 (2010). Lozman's § 1983 damages claim is against only the City itself, based on the acts of its officers and employees-here, the members of the City Council. Lozman says that the City, through its city councilmembers, formed an official policy to retaliate against him and ordered his arrest. The Court assumes in the discussion to follow that the arrest was taken pursuant to an official city policy, but whether there was such a policy and what its content may have been are issues not decided here.
This brings the discussion to the issue the parties deem central to the case: whether the conceded existence of probable cause for the arrest bars recovery regardless of any intent or purpose to retaliate for past speech. Two major precedents could bear on this point, and the parties disagree on which should be applicable here. The first is this Court's decision in Mt. Healthy City Bd. of Ed. v. Doyle, 429 U.S. 274, 97 S.Ct. 568, 50 L.Ed.2d 471 (1977). See also Board of Comm'rs, Wabaunsee Cty. v. Umbehr, 518 U.S. 668, 116 S.Ct. 2342, 135 L.Ed.2d 843 (1996). Lozman urges that the rule of Mt. Healthy should control and that under it he is entitled to recover. The second is this Court's decision in Hartman v. Moore, 547 U.S. 250, 126 S.Ct. 1695, 164 L.Ed.2d 441 (2006), which the City cites for the proposition that once there is probable cause there can be no further claim that the arrest was retaliation for protected speech.
Mt. Healthy arose in a civil, not criminal, context. A city board of education decided not to rehire an untenured school teacher after a series of incidents indicating unprofessional demeanor. 429 U.S., at 281-283, 97 S.Ct. 568. One of the incidents was a telephone call the teacher made to a local radio station to report on a new school policy. Id., at 282, 97 S.Ct. 568. Because the board of education did not suggest that the teacher violated any established policy in making the call, this Court accepted a finding by the District Court that the call was protected speech. Id., at 284, 97 S.Ct. 568. The Court went on to hold, however, that since the other incidents, standing alone, would have justified the dismissal, relief could not be granted if the board could show that the discharge would have been ordered even without reference to the protected speech. Id., at 285-287, 97 S.Ct. 568. In terms of precepts in the law of torts, the Court held that even if retaliation might have been a substantial motive for the board's action, still there was no liability unless the alleged constitutional violation was a but-for cause of the employment termination. Ibid. ; see also Umbehr, supra, at 675, 116 S.Ct. 2342.
The City resists the applicability of the Mt. Healthy test as the sole determinant here. It contends that, where there was probable cause for the arrest, the applicable precedent is Hartman -a case that was in the criminal sphere and that turned on the existence of probable cause.
The background in Hartman was that a company and its chief executive, William Moore, had engaged in an extensive lobbying and governmental relations campaign opposing a particular postal service policy. 547 U.S., at 252-253, 126 S.Ct. 1695. Moore and the company were later prosecuted for violating federal statutes in the course of that lobbying. Id., at 253-254, 126 S.Ct. 1695. After being acquitted, Moore filed suit against five postal inspectors, alleging that they had violated his First Amendment rights when they instigated his prosecution in retaliation for his criticisms of the Postal Service. Id., at 254, 126 S.Ct. 1695. This Court held that a plaintiff alleging a retaliatory prosecution must show the absence of probable cause for the underlying criminal charge. Id., at 265-266, 126 S.Ct. 1695. If there was probable cause, the case ends. If the plaintiff proves the absence of probable cause, then the Mt. Healthy test governs: The plaintiff must show that the retaliation was a substantial or motivating factor behind the prosecution, and, if that showing is made, the defendant can prevail only by showing that the prosecution would have been initiated without respect to retaliation. See 547 U.S., at 265-266, 126 S.Ct. 1695.
The Court in Hartman deemed it necessary to inquire as to the existence of probable cause because proving the link between the defendant's retaliatory animus and the plaintiff's injury in retaliatory prosecution cases "is usually more complex than it is in other retaliation cases." Id., at 261, 126 S.Ct. 1695. An action for retaliatory prosecution "will not be brought against the prosecutor, who is absolutely immune from liability for the decision to prosecute." Id., at 261-262, 126 S.Ct. 1695. Instead, the plaintiff must sue some other government official and prove that the official "induced the prosecutor to bring charges that would not have been initiated without his urging." Id., at 262, 126 S.Ct. 1695. Noting that inquiries with respect to probable cause are commonplace in criminal cases, the Court determined that requiring plaintiffs in retaliatory prosecution cases to prove the lack of probable cause would help "bridge the gap between the nonprosecuting government agent's motive and the prosecutor's action." Id., at 263, 126 S.Ct. 1695.
The City's argument here is that, just as probable cause is a bar in retaliatory prosecution cases, so too should it be a bar in this case, involving a retaliatory arrest. There is undoubted force in the City's position. Reichle, 566 U.S., at 667-668, 132 S.Ct. 2088. There are on average about 29,000 arrests per day in this country. Dept. of Justice-FBI, Uniform Crime Report, Crime in the United States, 2016 (Fall 2017). In deciding whether to arrest, police officers often make split-second judgments. The content of the suspect's speech might be a consideration in circumstances where the officer must decide whether the suspect is ready to cooperate, or, on the other hand, whether he may present a continuing threat to interests that the law must protect. See, e.g., District of Columbia v. Wesby, 583 U.S. ----, ----, 138 S.Ct. 577, 587, 199 L.Ed.2d 453 (2018) ("suspect's untruthful and evasive answers to police questioning could support probable cause" (internal quotation marks omitted)).
For these reasons retaliatory arrest claims, much like retaliatory prosecution claims, can "present a tenuous causal connection between the defendant's alleged animus and the plaintiff's injury." Reichle, 566 U.S., at 668, 132 S.Ct. 2088. That means it can be difficult to discern whether an arrest was caused by the officer's legitimate or illegitimate consideration of speech. Ibid. And the complexity of proving (or disproving) causation in these cases creates a risk that the courts will be flooded with dubious retaliatory arrest suits. See Brief for District of Columbia et al. as Amici Curiae 5-11.
At the same time, there are substantial arguments that Hartman 's framework is inapt in retaliatory arrest cases, and that Mt. Healthy should apply without a threshold inquiry into probable cause. For one thing, the causation problem in retaliatory arrest cases is not the same as the problem identified in Hartman . Hartman relied in part on the fact that, in retaliatory prosecution cases, the causal connection between the defendant's animus and the prosecutor's decision to prosecute is weakened by the "presumption of regularity accorded to prosecutorial decisionmaking." 547 U.S., at 263, 126 S.Ct. 1695. That presumption does not apply in this context. See Reichle, supra, at 669, 132 S.Ct. 2088. In addition, there is a risk that some police officers may exploit the arrest power as a means of suppressing speech. See Brief for Institute for Free Speech as Amicus Curiae .
IV
The parties' arguments raise difficult questions about the scope of First Amendment protections when speech is made in connection with, or contemporaneously to, criminal activity. But whether in a retaliatory arrest case the Hartman approach should apply, thus barring a suit where probable cause exists, or, on the other hand, the inquiry should be governed only by Mt. Healthy is a determination that must await a different case. For Lozman's claim is far afield from the typical retaliatory arrest claim, and the difficulties that might arise if Mt. Healthy is applied to the mine run of arrests made by police officers are not present here.
Here Lozman does not sue the officer who made the arrest. Indeed, Lozman likely could not have maintained a retaliation claim against the arresting officer in these circumstances, because the officer appears to have acted in good faith, and there is no showing that the officer had any knowledge of Lozman's prior speech or any motive to arrest him for his earlier expressive activities.
Instead Lozman alleges more governmental action than simply an arrest. His claim is that the City itself retaliated against him pursuant to an "official municipal policy" of intimidation. Monell, 436 U.S., at 691, 98 S.Ct. 2018. In particular, he alleges that the City, through its legislators, formed a premeditated plan to intimidate him in retaliation for his criticisms of city officials and his open-meetings lawsuit. And he asserts that the City itself, through the same high officers, executed that plan by ordering his arrest at the November 2006 city council meeting.
The fact that Lozman must prove the existence and enforcement of an official policy motivated by retaliation separates Lozman's claim from the typical retaliatory arrest claim. An official retaliatory policy is a particularly troubling and potent form of retaliation, for a policy can be long term and pervasive, unlike an ad hoc, on-the-spot decision by an individual officer. An official policy also can be difficult to dislodge. A citizen who suffers retaliation by an individual officer can seek to have the officer disciplined or removed from service, but there may be little practical recourse when the government itself orchestrates the retaliation. For these reasons, when retaliation against protected speech is elevated to the level of official policy, there is a compelling need for adequate avenues of redress.
In addition, Lozman's allegations, if proved, alleviate the problems that the City says will result from applying Mt. Healthy in retaliatory arrest cases. The causation problem in arrest cases is not of the same difficulty where, as is alleged here, the official policy is retaliation for prior, protected speech bearing little relation to the criminal offense for which the arrest is made. In determining whether there was probable cause to arrest Lozman for disrupting a public assembly, it is difficult to see why a city official could have legitimately considered that Lozman had, months earlier, criticized city officials or filed a lawsuit against the City. So in a case like this one it is unlikely that the connection between the alleged animus and injury will be "weakened ... by [an official's] legitimate consideration of speech." Reichle, 566 U.S., at 668, 132 S.Ct. 2088. This unique class of retaliatory arrest claims, moreover, will require objective evidence of a policy motivated by retaliation to survive summary judgment. Lozman, for instance, cites a transcript of a closed-door city council meeting and a video recording of his arrest. There is thus little risk of a flood of retaliatory arrest suits against high-level policymakers.
As a final matter, it must be underscored that this Court has recognized the "right to petition as one of the most precious of the liberties safeguarded by the Bill of Rights." BE & K Constr. Co. v.
NLRB, 536 U.S. 516, 524, 122 S.Ct. 2390, 153 L.Ed.2d 499 (2002) (internal quotation marks omitted). Lozman alleges the City deprived him of this liberty by retaliating against him for his lawsuit against the City and his criticisms of public officials. Thus, Lozman's speech is high in the hierarchy of First Amendment values. See Connick v. Myers, 461 U.S. 138, 145, 103 S.Ct. 1684, 75 L.Ed.2d 708 (1983).
For these reasons, Lozman need not prove the absence of probable cause to maintain a claim of retaliatory arrest against the City. On facts like these, Mt. Healthy provides the correct standard for assessing a retaliatory arrest claim. The Court need not, and does not, address the elements required to prove a retaliatory arrest claim in other contexts.
This is not to say, of course, that Lozman is ultimately entitled to relief or even a new trial. On remand, the Court of Appeals, applying Mt. Healthy and other relevant precedents, may consider any arguments in support of the District Court's judgment that have been preserved by the City. Among other matters, the Court of Appeals may wish to consider (1) whether any reasonable juror could find that the City actually formed a retaliatory policy to intimidate Lozman during its June 2006 closed-door session; (2) whether any reasonable juror could find that the November 2006 arrest constituted an official act by the City; and (3) whether, under Mt. Healthy, the City has proved that it would have arrested Lozman regardless of any retaliatory animus-for example, if Lozman's conduct during prior city council meetings had also violated valid rules as to proper subjects of discussion, thus explaining his arrest here.
For these reasons, the judgment of the Court of Appeals is vacated, and the case is remanded for further proceedings consistent with this opinion.
It is so ordered.

Question: What reason, if any, does the court give for granting the petition for certiorari?

Choices:
case did not arise on cert or cert not granted
federal court conflict
federal court conflict and to resolve important or significant question
putative conflict
conflict between federal court and state court
state court conflict
federal court confusion or uncertainty
state court confusion or uncertainty
federal court and state court confusion or uncertainty
to resolve important or significant question
to resolve question presented
no reason given
other reason

Answer: 10