I 
119TH CONGRESS 
1ST SESSION H. R. 4281 
To authorize the President to take actions to ensure Israel is prepared 
for all contingencies if Iran seeks to develop a nuclear weapon, and 
for other purposes. 
IN THE HOUSE OF REPRESENTATIVES 
JULY 2, 2025 
Mr. GOTTHEIMER (for himself, Mr. LAWLER, Mr. MOSKOWITZ, Mr. SUOZZI, 
and Mr. VARGAS) introduced the following bill; which was referred to the 
Committee on Foreign Affairs 
A BILL 
To authorize the President to take actions to ensure Israel 
is prepared for all contingencies if Iran seeks to develop 
a nuclear weapon, and for other purposes. 
Be it enacted by the Senate and House of Representa-
tives of the United States of America in Congress assembled, 
SECTION 1. SHORT TITLE. 
This Act may be cited as the ‘‘Bunker Buster Act 
of 2025’’. 
SEC. 2. FINDINGS. 
Congress finds the following: 
(1) The United States Nuclear Regulatory 
Commission defines ‘‘high-enriched uranium’’ as 
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uranium enriched to at least 20 percent uranium- 
235. 
(2) Under the 2015 Joint Comprehensive Plan 
of Action, Iran agreed to refrain from producing en-
riched uranium containing more than 3.67 percent 
uranium-235 for 15 years. 
(3) On January 13, 2019, the head of the 
Atomic Energy Organization of Iran, Dr. Ali Akbar 
Salehi, told the Fars News Agency, ‘‘If we want to 
come out of the nuclear deal and produce, within 
four days we could start our 20 percent.’’. 
(4) On April 16, 2021, Dr. Salehi told the state 
television that Iran had begun enriching uranium to 
60 percent. 
(5) On July 14, 2021, the former President of 
Iran, President Hassan Rouhani, said during a press 
conference that Iran has the knowledge and ability 
to enrich weapons-grade uranium at 90 percent. 
(6) According to an International Atomic En-
ergy Agency (IAEA) report, as of May 11, 2024, 
Iran has 142.1 kilograms (313.2 pounds) of ura-
nium enriched up to 60 percent, an increase of 20.6 
kilograms (45.4 pounds) since the last report by the 
United Nations watchdog in February. Uranium en-
riched at 60 percent purity is just a short, technical 
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step away from weapons-grade levels of 90 percent. 
Iran’s overall stockpile of enriched uranium stands 
at 6,201.3 kilograms (1,3671.5 pounds), which rep-
resents an increase of 675.8 kilograms (1,489.8 
pounds) since the IAEA’s previous report. 
(7) The current stockpile is enough to make 
several nuclear bombs according to the criteria the 
IAEA uses to make such determinations. 
(8) Reports indicate the Iran may be con-
structing new facilities to help expand its nuclear 
program. 
(9) In June 2024, the IAEA elected to censure 
Iran for its violation of international responsibilities 
under its nuclear agreement and demanded its co-
operation, including the readmittance of inspectors 
and the restoration of camera surveillance at nuclear 
sites. 
(10) In June the IAEA announced Iran is in-
stalling 1,400 new advanced centrifuges at its 
Fordow facility. 
(11) Since October 7, 2023, Israel has been at 
war with Hamas in the Gaza strip, which has used 
Iranian funding and direction to target the Jewish 
state. 
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(12) Hamas continues to hide within civilian in-
frastructure, fire rockets at humanitarian crossings, 
and steal international aid and resources that are 
only further hurting the Palestinian civilians. Hamas 
has built tunnels under United Nations Relief and 
Works Agency for Palestine Refugees in the Near 
East (UNRWA) buildings, including a large data 
center under UNRWA’s Gaza base, and stores weap-
ons in UNRWA schools. 
(13) As of June 2024, Ansarullah, or otherwise 
known as the Houthis, have launched at least 60 at-
tacks at ships. They have seized 1 vessel, killed 4 
sailors, and sunk 2 ships since November 2023. The 
Houthis have also launched drones, missiles, and 
mortars toward Israel and at United States and its 
allies. The Houthis operate with Iranian funds. 
(14) Since October 7, 2023, Hezbollah has 
launched over 5,000 rockets, missiles, and drones at 
Israel. Iran has, provided Hezbollah with more than 
100,000 missiles and rockets. 
(15) Iran is expanding its missile capacity and 
weaponization program to further assist their prox-
ies across the region. 
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(16) On June 12, 2025, 60 days had lapsed 
without an agreement in diplomatic negotiations to 
prevent Iran from attaining a nuclear weapon. 
(17) On June 12, 2025, IAEA board declared 
Iran in violation of its non-proliferation obligations. 
(18) On June 13, 2025, Israel launched a co-
ordinated series of strikes against Iranian military 
and government targets in efforts to disrupt Iran’s 
development of a nuclear weapon based on Israeli in-
telligence assessment that Iran had taken steps put-
ting them closer to achieving nuclear latency. 
SEC. 3. SENSE OF CONGRESS. 
It is the sense of Congress that the United States 
should— 
(1) seek to extend the limitations on Iran’s en-
riched uranium, including through engagement in 
multilateral diplomatic initiatives; 
(2) ensure that Israel and other allies are pre-
pared for all contingencies if Iran pursues develop-
ment of a nuclear weapon; 
(3) send a clear signal to Iran that development 
of a nuclear weapon will never be tolerated; and 
(4) reaffirm the United States commitment to 
deter Iranian nuclear development with a credible 
military threat. 
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SEC. 4. ACTIONS TO ENSURE ISRAEL IS PREPARED FOR 
ALL CONTINGENCIES IF IRAN SEEKS TO DE-
VELOP A NUCLEAR WEAPON. 
(a) IN GENERAL.—Subject to the preliminary condi-
tions described in subsection (b), the President is author-
ized to take the actions described in subsection (c), upon 
the request of the Government of Israel, to ensure Israel 
is prepared for all contingencies if Iran seeks to develop 
a nuclear weapon. 
(b) PRELIMINARY CONDITIONS.—The President may 
exercise the authority of subsection (a) only if the Presi-
dent first determines and certifies to Congress that it is 
vital to the national security interests of the United States 
to do so and the conditions in subsection (c)(2)(B) are 
met. 
(c) ACTIONS DESCRIBED.—The actions described in 
this subsection are the following: 
(1) To provide for the construction of infra-
structure in Israel to accommodate large ordnance 
systems that are designed to destroy underground 
nuclear infrastructure, including— 
(A) construction of extended runways for 
aircraft that carry the Massive Ordnance Pene-
trator (MOP); 
(B) aircraft to carry and deliver the MOP; 
(C) basing options for such aircraft; and 
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(D) munition storage facilities. 
(2)(A) To store in the territory of Israel the 
MOP or related munitions described in paragraph 
(1), to be used by the United States except as pro-
vided in subparagraph (B). 
(B) To transfer the MOP or related munitions 
described in paragraph (1) to Israeli custody if the 
President determines and certifies to Congress 
that— 
(i) Iran— 
(I) is in noncompliance with the NPT 
Safeguards Agreement; 
(II) has modified its implementation 
of the NPT Safeguards Agreement (includ-
ing modified Code 3.1); or 
(III) as determined by the President, 
has reduced access of inspectors of the 
IAEA in such a manner so as to be preju-
dicial to the IAEA’s ability to provide con-
fidence as to the non-diversion of declared 
nuclear material and absence of undeclared 
nuclear activities; 
(ii) it is vital to the national security of the 
United States to do so; 
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(iii) Israel has no other means to achieve 
a mutual national security objective of destroy-
ing Iran’s underground nuclear infrastructure 
or facilities; and 
(iv) a dual key control system is in place 
requiring approval by the President, acting 
through the Secretary of Defense (which may 
not be further delegated) for deployment of the 
MOP or related munitions described in para-
graph (1) prior to Israeli deployment of such 
munitions. 
(3) To provide for training of Israeli personnel 
with respect to the MOP or related munitions de-
scribed in paragraph (1). 
(4) To conduct joint research and development 
with Israel to— 
(A) enhance United States ordnance; and 
(B) develop Israeli capability for ordnance 
to destroy underground infrastructure, includ-
ing Hezbollah rocket storage and manufac-
turing facilities and underground Iranian nu-
clear facilities. 
(d) NPT SAFEGUARDS AGREEMENT DEFINED.—In 
this section, the term ‘‘NPT Safeguards Agreement’’ 
means the Agreement between Iran and the International 
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Atomic Energy Agency for the Application of Safeguards 
in Connection with the Treaty on the Non-Proliferation 
of Nuclear Weapons, which entered into force on May 15, 
1974. 
SEC. 5. RULE OF CONSTRUCTION. 
Nothing in this Act may be construed to serve as an 
authorization for the use of military force against Iran. 
Æ 
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