Senate Republicans Reverse Iran War Powers Vote After Trump Pressure

Senate Republicans abruptly reversed course on restricting President Trump's military authority over Iran, rejecting a war powers measure on Wednesday evening after initially supporting similar legislation the previous day. The procedural vote failed 50-47, with Republicans Rand Paul and Bill Cassidy changing their positions following a contentious meeting with Trump.

The Reversal

On Tuesday, the Senate narrowly approved a House-passed resolution to limit Trump's war powers in Iran. Just 24 hours later, the chamber rejected Senator Tim Kaine's similar measure aimed at forcing removal of U.S. armed forces from Iranian hostilities unless Congress granted explicit authorization. Two Republicans—Senators Susan Collins and Lisa Murkowski—maintained their support for the Kaine resolution, while Paul voted present and Cassidy voted against advancing it.

The dramatic shift followed a heated Wednesday lunch meeting between Trump and Senate Republicans at the Capitol. During the meeting, Trump expressed frustration about senators undermining his negotiating position with Iran. Senator Cassidy of Louisiana, who had supported Tuesday's resolution, engaged in a direct confrontation with the president. Cassidy later told reporters that Trump "raised his voice" during the exchange and that he "lost my temper" in response.

Justifications for the Change

Following the contentious meeting, both Paul and Cassidy offered explanations for their vote reversals. Paul stated his fundamental position on war and executive power "has not changed" but that he voted present to "give the President more space and leverage to negotiate a lasting peace." Cassidy received a briefing from Vice President JD Vance and special envoy Steve Witkoff at the White House, after which he posted appreciation for addressing his concerns. Trump celebrated the outcome on Truth Social, specifically noting the Republicans' changed positions.

The Trump administration has maintained that the U.S. is no longer engaged in active hostilities with Iran following a ceasefire. Administration officials have also argued the 1973 War Powers Resolution itself is unconstitutional, positioning the debate as broader than Iran alone. Even if the Kaine resolution had passed both chambers, Trump would likely have vetoed it.