H.Res. 1099: Reaffirming Iran remains the largest state sponsor of terrorism.
Sponsor
Brian Mast
Republican · FL-21
Bill Progress
Latest Action · Mar 5, 2026
Passed the House, received in Senate
Why it matters
It signals continued hardline U.S. pressure on Iran at a time of renewed concern over proxy attacks, assassination plots, and Tehran's nuclear activities.
H. Res. 1099 is a statement-of-position measure, not a bill that directly changes sanctions, spending, or criminal law. Its core purpose is simple: the House formally declares that Iran continues to be the largest state sponsor of terrorism. The text ties that conclusion to Iran's support for Hezbollah, Hamas, the Houthis, and other proxy groups, as well as to attacks that have killed Americans.
The resolution builds its case by listing a series of allegations and findings. It points to Pentagon estimates that Iranian-backed militias were responsible for the deaths of at least 603 U.S. service members in Iraq. It also references the January 2024 attack on Tower 22 in Jordan that killed three U.S. soldiers, describing it as an Iranian-backed proxy attack. The measure further accuses Tehran of backing assassination plots on U.S. soil and harboring senior al-Qaeda figures.
It also connects terrorism concerns to Iran's nuclear program. The text says Iran's refusal to abandon its nuclear and missile activities led to the reimposition of six U.N. Security Council resolutions in September 2025, and it cites IAEA Director General Rafael Grossi's concerns about Iran's uranium stockpile and lack of access to undeclared sites. That linkage matters because Congress is framing Iran not just as a regional proxy threat, but as a broader strategic danger.
In practical terms, the resolution is mostly about messaging, oversight, and political positioning. It can strengthen the case for future sanctions, military deterrence, diplomatic isolation, or tighter enforcement of existing Iran policy. It also puts members of Congress on the record, which can shape debate over Middle East policy, U.S. force protection, and any future negotiations with Tehran.
What does H.Res. 1099 do?
Declares Iran the top state sponsor of terrorism
The resolution states that it is U.S. policy that Iran remains the world's largest state sponsor of terrorism.
Cites support for proxy groups
It points to Iran's financial and military backing for Hezbollah, Hamas, and the Houthis as key reasons for that conclusion.
Links Iran to American deaths
The measure highlights U.S. military casualties in Iraq and the 2024 Tower 22 attack in Jordan to argue that Iran-backed forces have killed Americans.
Calls out alleged plots on U.S. soil
It accuses the Iranian regime of being behind assassination plots targeting American citizens and government officials inside the United States.
Raises al-Qaeda safe haven concerns
The resolution says Tehran has allowed senior al-Qaeda leaders to operate from Iranian territory and raise funds.
Ties terror concerns to nuclear activity
It connects Iran's terrorism role to its nuclear and missile programs, citing U.N. action and IAEA concerns about uranium enrichment and blocked inspections.
Who benefits from H.Res. 1099?
Iran hawks in Congress
They gain a formal House statement supporting a tougher line on Iran and more pressure-based policy.
Families of U.S. service members and victims of attacks
They get public recognition from Congress that Iran and its proxies are being blamed for attacks that killed Americans.
U.S. national security advocates
They can use the resolution to support stronger deterrence, sanctions enforcement, and force-protection policies.
Regional partners opposed to Iran
Countries and governments threatened by Iran-backed groups may see this as a sign of continued U.S. political alignment with their security concerns.
Who is affected by H.Res. 1099?
Iranian government and state-linked entities
They face added political condemnation and a stronger basis for future sanctions or diplomatic isolation.
U.S. diplomats and negotiators
They may have less room politically to pursue engagement with Iran without facing criticism from Congress.
U.S. troops and personnel in the Middle East
The resolution keeps attention on threats from Iranian-backed groups and could shape future force protection decisions.
Humanitarian and business groups dealing with Iran
Even without new legal penalties, tougher political rhetoric can increase uncertainty around trade, aid delivery, and compliance risk.
HRES1099 Legislative Journey
House: Vote: 372-53
Mar 5, 2026
On motion to suspend the rules and agree to the resolution Agreed to by the Yeas and Nays: (2/3 required): 372 - 53, 2 Present (Roll no. 84).
House: Vote Held
Mar 4, 2026
At the conclusion of debate, the Yeas and Nays were demanded and ordered. Pursuant to the provisions of clause 8, rule XX, the Chair announced that further proceedings on the motion would be postponed.
About the Sponsor
Brian Mast
Republican, Florida's 21st congressional district · 9 years in Congress
Committees: Foreign Affairs, Transportation and Infrastructure
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Cosponsors (2)
All 2 cosponsors are Republicans. Cosponsors represent 2 states: California, Indiana.
Committee Sponsors
27 Republicans across this committee haven't cosponsored yet. Mobilize their constituents
H.Res. 1099 Quick Facts
- Committee
- Foreign Affairs
- Chamber
- House
- Policy
- International Affairs
- Introduced
- Mar 4, 2026
Passed the House, received in Senate
Mar 5, 2026
H.Res. 1099 Bill Text
“Reaffirming Iran remains the largest state sponsor of terrorism.”
Source: U.S. Government Publishing Office
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