The U.S. Senate has taken a step toward limiting President Donald Trump’s authority to conduct military operations against Iran, after a resolution advanced for the first time following several previous attempts.
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Senators voted 50–47 on Tuesday to discharge the proposal from committee, allowing it to move forward for broader consideration in the chamber. The measure has been championed by Tim Kaine, a Democrat from Virginia, who argues that Congress should have a greater role in decisions about military engagement with Iran.
Four Republican senators — Susan Collins of Maine, Lisa Murkowski of Alaska, Rand Paul of Kentucky and Bill Cassidy of Louisiana — joined most Democrats in backing the procedural step. John Fetterman of Pennsylvania was the only Democrat to vote against advancing the measure.
The result marks the first time Cassidy has supported moving a war powers resolution forward. His vote came shortly after he failed to secure enough support to reach a runoff in the Louisiana Republican Senate primary, where Trump had endorsed a rival candidate.
Republican absences influence outcome
Three Republican senators — John Cornyn of Texas, Tommy Tuberville of Alabama and Thom Tillis of North Carolina — did not vote. Their absence helped tip the balance in favour of Democrats, who had previously failed seven times to advance similar resolutions relating to Iran.
Following the vote, Senate Minority Leader Chuck Schumer said the outcome showed growing Republican willingness to challenge the president’s approach to the conflict.
“Vote by vote, Democrats are breaking through Republicans’ wall of silence on Trump’s illegal war,” Schumer said in a statement, adding that the latest vote suggested momentum was building to curb the president’s authority.
Proposal seeks congressional approval for hostilities
Kaine’s resolution would direct the president to withdraw U.S. forces from hostilities involving Iran unless Congress explicitly authorizes military action through a declaration of war or a specific authorization for the use of military force.
The vote only clears an initial procedural hurdle in the Senate. Even if the resolution eventually passes both chambers of Congress, Trump would be expected to veto it.
Democrats nevertheless argue that congressional action could still influence the administration’s approach to the conflict.
Debate intensifies amid military tensions
The Senate vote came a day after Trump said the United States would not carry out “scheduled” attacks on Iran on Tuesday, although he said he had been close to approving the strikes.
Speaking to reporters before the vote, Kaine said the timing underscored the need for lawmakers to debate the rationale and strategy behind U.S. involvement.
“It’s the perfect time to do what we should have done in February and have a congressional discussion about rationale, plan, [and] strategy,” he said.
Kaine also highlighted the economic impact of the conflict, noting rising fuel costs for Americans. With the Memorial Day holiday approaching, he said many people travelling would notice higher gasoline prices compared with the previous year.
Public opinion a factor
The Virginia senator said lawmakers were hearing growing opposition to the war from constituents.
“I know what we are all hearing from our constituents, and that is, they are deeply opposed to this war,” Kaine said.
He added that public sentiment was continuing to shift, which he believes could eventually help secure enough support in Congress to pass the resolution.
Adapted by ASEAN Now. Source 20 May 2026
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