Senate passes Iran war powers measure 50-48 in narrow vote

Congress moved to reassert its role in decisions of war when the Senate approved a resolution directing President Trump to end U.S. military action against Iran unless lawmakers grant explicit authorization. The 50-48 vote, which followed House passage earlier in the month, marked the first time both chambers had cleared such a measure under the 1973 War Powers Act.

Four Republicans joined Democrats: Susan Collins of Maine, Rand Paul of Kentucky, Bill Cassidy of Louisiana and Lisa Murkowski of Alaska. One Democrat, John Fetterman of Pennsylvania, opposed it. Two Republicans, Mitch McConnell and David McCormick, did not vote. The narrow margin reflected limited but visible erosion of unified Republican support for the campaign that began with U.S. and Israeli strikes on Feb. 28 and produced a ceasefire announced in early April.

Trump called the timing poor and the measure meaningless on Truth Social, saying it aided Iran while talks continued. The White House maintained that hostilities had already ended under the ceasefire and that the resolution carried no legal force because concurrent resolutions do not require presidential signature and face constitutional questions after the 1983 Supreme Court ruling in INS v. Chadha. Supporters, including Sen. Tim Kaine and Rep. Gregory Meeks, argued the vote reinforced Congress’s constitutional authority and sent a political signal even if enforcement remained uncertain.

The underlying military conflict and its reported costs, including estimates reaching $40 billion from one think tank, could not be independently verified across multiple outlets. Negotiations over nuclear inspections and access to the Strait of Hormuz were described as ongoing, yet details of Iranian positions and any interim agreements also lacked corroboration from primary records. Legal experts noted that any attempt to enforce the resolution would likely reach the courts, leaving its practical effect unresolved.