H.Res. 1099: Reaffirming Iran remains the largest state sponsor of terrorism.

Introduced Mar 4, 20262 cosponsors

Sponsor

Brian Mast

Brian Mast

Republican · FL-21

Bill Progress

IntroducedMar 4
Committee 
Pass HouseMar 5
Pass Senate 
Signed 
Law 

Latest Action · Mar 5, 2026

1/2

Passed the House, received in Senate

House doubles down on Iran terror label

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.

What does H.Res. 1099 do?

1

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.

2

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.

3

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.

4

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.

5

Raises al-Qaeda safe haven concerns

The resolution says Tehran has allowed senior al-Qaeda leaders to operate from Iranian territory and raise funds.

6

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

2 actions

House: Vote: 372-53

Mar 5, 2026

372-53

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

Brian Mast

Republican, Florida's 21st congressional district · 9 years in Congress

Committees: Foreign Affairs, Transportation and Infrastructure

View full profile →

Cosponsors (2)

This bill gained 2 cosponsors in the last 30 days

All 2 cosponsors are Republicans. Cosponsors represent 2 states: California, Indiana.

2Republicans·2 states

Committee Sponsors

Foreign Affairs Committee

23D28R
|1 signed50 not yet

1 of 51 committee members cosponsored

27 Republicans across this committee haven't cosponsored yet. Mobilize their constituents

H.Res. 1099 Quick Facts

Cosponsors
2+2
Erin Houchin
Darrell Issa
Committee
Foreign Affairs
Chamber
House
Policy
International Affairs
Introduced
Mar 4, 2026

Passed the House, received in Senate

Mar 5, 2026

Constituent Resources

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H.Res. 1099 Bill Text

PDF

Reaffirming Iran remains the largest state sponsor of terrorism.

Source: U.S. Government Publishing Office

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