More than 250 American organizations signed an open letter on March 11, 2026, calling on Congress to immediately halt funding for the military campaign against Iran. The letter, coordinated by a broad coalition of civil society groups, marked one of the most significant domestic challenges to the war effort.
The Letter
The open letter, addressed to both chambers of Congress, argued that the military operation against Iran had not been properly authorized under the War Powers Act and the Constitution. Signatories demanded that Congress exercise its power of the purse to defund the campaign until a formal authorization for the use of military force was debated and voted upon.
“No president has the unilateral authority to launch a war of this magnitude without congressional approval,” the letter stated. “The American people, through their elected representatives, must have a say in whether this nation commits to a military conflict with potentially devastating consequences.”
Broad Coalition
The 250-plus signatories represented a diverse cross-section of American civil society, including:
- Anti-war and peace organizations
- Civil liberties groups
- Religious organizations from multiple faith traditions
- Veterans’ organizations
- Progressive and libertarian policy institutes
- Labor unions
- Academic and scholarly associations
The breadth of the coalition underscored the extent of domestic opposition to the war, which crossed traditional political lines. Both progressive Democrats and libertarian-leaning Republicans had expressed reservations about the conflict from its outset.
Congressional Response
The letter intensified an already heated debate in Congress. Several members introduced resolutions invoking the War Powers Act to compel a withdrawal of US forces from the conflict within 60 days. However, the resolutions faced uncertain prospects, as congressional leadership in both parties was divided on the issue.
Supporters of the military operation argued that existing authorizations for the use of military force, combined with the president’s constitutional authority as commander-in-chief, provided sufficient legal basis for the campaign. They pointed to the threat posed by Iran’s nuclear program and its attacks on US allies as justification.
Cost Argument
The organizations highlighted the staggering financial cost of the operation, citing the $11.3 billion spent in the first week alone. The letter argued that these funds could be better directed toward domestic priorities including healthcare, infrastructure, and education.
“At nearly $2 billion per day, this war is draining resources that American communities desperately need,” the letter stated. “Congress must demand accountability for this expenditure.”
Public Opinion
Polling data released alongside the letter showed that a significant portion of American voters opposed the war or expressed reservations about its scope and duration. Support for the military operation was strongest among older voters and those aligned with the administration, while younger voters and independents showed higher levels of opposition.
The gap between public sentiment and policy was cited by letter signatories as evidence that Congress had failed in its oversight role.
Historical Parallels
Commentators drew parallels to previous anti-war movements in American history, noting that the speed of the organizing effort — less than two weeks after the conflict began — reflected the infrastructure built by peace movements during the wars in Iraq, Afghanistan, and the broader war on terror.
Administration Response
The White House pushed back against the letter, arguing that the president had the constitutional authority to defend American interests and allies. Administration officials also noted that Iran’s attacks on US forces and allied nations constituted a direct threat that required an immediate military response.
Senator Lindsey Graham, a prominent supporter of the operation, stated publicly that while ground troops were not needed, the war “won’t end soon” — a comment that appeared to validate the concerns raised by the letter’s signatories about the potential for an open-ended conflict.