Washington, D.C., March 5, 2026 – In the first formal congressional vote related to the ongoing U.S.-Israeli military campaign against Iran, Senate Republicans on Wednesday defeated a bipartisan War Powers Resolution that sought to require President Donald Trump to obtain explicit congressional approval before continuing or expanding offensive military operations against Iranian forces.
The measure, introduced under the War Powers Resolution of 1973, failed on a near party-line vote of 47-53. Forty-six Democrats, together with Independent Senators Bernie Sanders (VT) and Angus King (ME), supported the resolution. All 53 Republican senators present voted against it. Two Republican senators were absent and did not vote.
The resolution, sponsored by Sen. Tim Kaine (D-VA) and co-sponsored by Sen. Todd Young (R-IN), Sen. Chris Murphy (D-CT), and several other bipartisan members, would have directed the President to terminate the use of U.S. Armed Forces in hostilities against Iran or Iranian-backed forces within 30 days unless Congress explicitly authorized continued action through a new Authorization for Use of Military Force (AUMF) or a formal declaration of war.
Supporters argued that the scale, duration, and geographic scope of the current campaign—now in its sixth day and involving direct strikes on Iranian territory, the sinking of an Iranian frigate in the Indian Ocean, and U.S. defensive operations across the Gulf—constituted “hostilities” under the War Powers Resolution, triggering the 60-day clock for congressional authorization.
“Congress has a constitutional duty to decide when the nation goes to war,” Sen. Kaine said in floor remarks before the vote. “We cannot allow the executive branch to unilaterally commit the United States to a potentially open-ended conflict with a nation of 90 million people without debate or a vote. This is not about undermining the President’s ability to defend American forces—it is about reclaiming Congress’s rightful role.”
Republican leaders countered that the resolution was premature, unnecessary, and would send a signal of disunity to allies and adversaries at a critical moment. Senate Majority Leader John Thune (R-SD) called the measure “a dangerous political stunt” that would “embolden Iran and its proxies while our forces are actively engaged in protecting American interests and our Israeli ally.”
“President Trump has the inherent Article II authority as Commander-in-Chief to respond to imminent threats and protect U.S. personnel and partners,” Thune stated. “This is not a new war—it is a necessary and proportionate response to years of Iranian aggression, including attacks on U.S. forces, support for terrorism, and pursuit of nuclear weapons.”
The vote followed intense lobbying from both the White House and progressive advocacy groups. President Trump personally called several Republican senators in the hours before the vote, urging them to reject the resolution. In a Truth Social post Tuesday night, Trump wrote: “The Radical Left Democrats and a few RINOs want to tie my hands while our brave military is finally hitting Iran hard. They will NEVER succeed. America First!”
The campaign began on February 28, 2026, with coordinated U.S.-Israeli airstrikes that killed Supreme Leader Ayatollah Ali Khamenei and numerous senior IRGC commanders. Operations have since expanded to include sustained suppression of Iranian air defenses, destruction of missile stockpiles, and—most recently—the sinking of the Iranian frigate IRIS Dena by a U.S. submarine in the Indian Ocean on March 4, marking the first combat torpedo sinking of an enemy surface vessel by a U.S. submarine since World War II.
Iran has retaliated with multiple waves of ballistic missiles, cruise missiles, and drones targeting Israeli military sites and U.S. bases in Gulf states, causing casualties including six U.S. service members killed in Kuwait. The conflict has severely disrupted global energy markets, with Iran effectively closing the Strait of Hormuz to most commercial traffic, Brent crude trading near $82 per barrel, and QatarEnergy declaring force majeure on LNG exports.
Democrats and some Republican critics argued that the Senate’s refusal to assert its war powers sets a dangerous precedent, especially given the campaign’s geographic reach (now extending to the Indian Ocean) and the risk of broader escalation involving proxies such as Hezbollah, Iraqi militias, and the Houthis.
Sen. Rand Paul (R-KY), one of the few Republicans to publicly support the resolution, said: “I support strong action against Iran’s nuclear ambitions and terrorism sponsorship, but Congress must not abdicate its responsibility. Once we allow endless presidential wars without authorization, we lose the republic.”
The failed vote does not legally prevent further U.S. military action but highlights deep partisan divisions over executive war powers—a recurring issue since the 2001 and 2002 AUMFs. No new stand-alone AUMF specific to Iran has been introduced in the current Congress, and prospects for one remain uncertain given the Republican majority in both chambers.
White House Press Secretary Karoline Leavitt called the resolution’s defeat “a strong bipartisan rejection of weakness” and reiterated that the administration would continue operations “until the Iranian threat is neutralized.”
Iranian Foreign Minister Abbas Araghchi responded to the Senate vote by accusing the U.S. Congress of “complicity in aggression” and warning that continued military action would meet a “crushing response.” Tehran has promised retaliation for the sinking of IRIS Dena and other strikes, raising fears of expanded asymmetric attacks on shipping, energy infrastructure, or U.S. interests.
As the conflict shows no immediate signs of de-escalation, the Senate’s action effectively preserves President Trump’s current operational latitude while underscoring ongoing congressional reluctance to formally constrain or endorse the campaign.
