The Senate Voted to Limit Trump's Iran War Powers. One Day Later, It Took the Vote Back.

The Senate spent two days sending opposite messages about President Trump and the war with Iran.

On Tuesday, it adopted a war powers resolution telling the president to pull U.S. forces out of hostilities with Iran. On Wednesday night, it refused to advance a second, nearly identical measure. Two Republicans who had backed the first resolution, Bill Cassidy of Louisiana and Rand Paul of Kentucky, changed their votes in between. The reversal handed Trump the outcome he wanted and left Congress without a binding check on his Iran policy.

Two votes, one day apart

The Tuesday vote was on a resolution the House had already passed earlier in June. The Senate adopted it 50 to 48. Four Republicans crossed over to join Democrats: Cassidy, Paul, Susan Collins of Maine, and Lisa Murkowski of Alaska. Democrat John Fetterman of Pennsylvania voted no.

That resolution was a concurrent resolution. It does not go to the president's desk and does not carry the force of law. NPR described it as a symbolic measure that reflected bipartisan frustration with the war rather than a binding order.

The Wednesday vote was different in form and in stakes. It was a procedural motion to advance a separate resolution from Democratic Senator Tim Kaine of Virginia. Kaine's measure would have directed the president to "remove the United States Armed Forces from hostilities within or against Iran" unless Congress authorized them, and unlike Tuesday's resolution, it would have required Trump's signature if it cleared both chambers. The motion failed 50 to 47. Collins and Murkowski again voted to advance it. Cassidy voted no. Paul voted present. Fetterman again voted no.

What moved Cassidy and Paul

Between the two votes, Trump met privately with Senate Republicans at a Wednesday lunch. CBS News reported that the meeting turned testy, that Trump told Cassidy to sit down, and that Cassidy afterward said Trump "raised his voice" and that he himself had "lost my temper."

Later that day, Cassidy was briefed on Iran at the White House by Vice President JD Vance and special envoy Steve Witkoff. Cassidy wrote on X that the conversation "address[ed] many of my concerns." He voted against advancing the Kaine resolution that night.

Paul, who had supported the last several Iran war powers measures, voted present. He wrote on X that his aim was to "give the President more space and leverage to negotiate a lasting peace."

"My opinion on the debate over war and executive power has not changed and I have voted that way several times," Paul wrote. "But since hostilities seem to be over and the President asked me to give consideration to his negotiating position, I will do so."

The law underneath it

Both resolutions run through the War Powers Resolution of 1973, the law Congress passed over President Nixon's veto to set up a process for forcing a president to end an unauthorized use of military force. The Trump administration has argued that the law is unconstitutional, and it has said the U.S. is no longer engaged in hostilities with Iran because the two sides are under a ceasefire.

That ceasefire is the backdrop for the votes. Trump signed a memorandum of understanding with Iran to extend the pause in fighting for 60 days and to open talks on Iran's nuclear program. CBS noted the practical effect of Kaine's resolution was unclear regardless of Wednesday's vote, because Trump would likely have vetoed it even if it had passed both chambers.

What it changes

In concrete terms, nothing now constrains the president's hand on Iran. The binding measure is dead in the Senate for now. The symbolic one that passed Tuesday never had legal force to begin with. Trump posted on Truth Social that Wednesday's vote "puts Iran on notice."

The sequence also showed the limits of the Tuesday rebuke. The first vote was the first time an Iran war powers resolution had advanced in the Senate after a string of failed attempts. One day later, the same chamber declined to take the next step.