The Senate rejected a Democratic bid to force President Donald Trump to withdraw U.S. forces from hostilities in Iran, voting 47-48 on Tuesday to block a motion that would have pulled the war powers resolution out of the Foreign Relations Committee and onto the floor. The margin was razor-thin, and the swing vote came from an unlikely place.
Sen. John Fetterman of Pennsylvania, a Democrat, voted with nearly every Republican to keep the resolution bottled up. His defection denied his own party the simple majority it needed, just days after Trump announced a diplomatic breakthrough that extended a ceasefire with Iran for 60 days and reopened the Strait of Hormuz.
The timing tells the story. Democrats chose to push a war powers challenge at the precise moment the president's diplomacy appeared to be producing results. And the one Democrat willing to say so with his vote was Fetterman, a senator who has repeatedly broken with his party on matters involving Iran and the Middle East.
The resolution in question, sponsored by Sen. Raphael Warnock of Georgia, is a joint resolution. That distinction matters. Unlike the concurrent resolution the House passed on June 3, sponsored by Rep. Gregory Meeks of New York and approved 215-208, a joint resolution carries the force of law. It would require the president's signature.
The House measure is largely symbolic. Trump is not legally bound to comply with it. Warnock's version, had it reached the floor and passed, would have landed on the president's desk. And there is little question about what would have happened next.
Tuesday's motion sought to discharge the resolution from the Foreign Relations Committee, where it had been parked. That motion failed by a single vote. Five senators were absent entirely: Republicans Josh Hawley of Missouri and Mitch McConnell of Kentucky, Independent Bernie Sanders of Vermont, and Democrats Michael Bennett of Colorado and Cory Booker of New Jersey. None of their reasons for missing the vote have been made public.
Had even one of those absent senators shown up and voted yes, the outcome could have flipped.
Fetterman's vote was the decisive one. Every other Democrat present voted to advance the resolution. Fetterman delivered the deciding vote to preserve Trump's authority on Iran, siding with the bulk of the Republican conference against his own party's leadership.
It is not the first time. Fetterman has carved out a distinct lane on foreign policy, particularly where Iran and Israel are concerned. He has publicly warned that Jewish voters face a difficult future inside the Democratic Party and has accused fellow Democrats of sympathizing with Tehran's interests over America's.
That pattern makes his vote Tuesday less surprising than it might look on paper. Fetterman has accused fellow Democrats of "rooting for Iran" as a rift inside the party over Middle East policy has deepened. His willingness to cross the aisle on a high-profile procedural vote, one his party badly wanted to win, puts that rift in sharp relief.
While Fetterman held the line for the president, four Republican senators voted to advance the resolution: Bill Cassidy of Louisiana, Susan Collins of Maine, Lisa Murkowski of Alaska, and Rand Paul of Kentucky.
Paul's vote tracks with his long-standing libertarian skepticism of executive war-making. Collins and Murkowski have frequently parted ways with their conference on high-profile votes. But Cassidy's position is worth examining more closely.
Cassidy also voted for a prior motion to discharge a separate war powers resolution, this one sponsored by Sen. Tim Kaine of Virginia, that passed the Senate 50-47 in May. Cassidy broke ranks on the Iran war powers vote days after losing his Louisiana primary to Julia Letlow, a Republican congresswoman endorsed by Trump. A senator with nothing left to lose electorally has different incentives than one facing voters again.
The vote did not happen in a vacuum. On Sunday, just two days before the Senate acted, Trump announced a diplomatic breakthrough that extended a ceasefire for 60 days and included the opening of the Strait of Hormuz, one of the world's most strategically important waterways. No text of the deal has been released publicly.
That announcement changed the political ground beneath the war powers push. Democrats were asking the Senate to rebuke the president's military posture at the very moment that posture appeared to be yielding diplomatic concessions. Whatever one thinks of the underlying policy, the optics of the timing were difficult for war powers proponents to explain away.
The ceasefire extension and the Hormuz opening are precisely the kind of outcomes that military leverage is designed to produce. Stripping the president of that leverage mid-negotiation, even symbolically, sends a signal to adversaries that Congress may do the work of constraining American power for them.
Tuesday's vote does not end the war powers fight. Kaine's separate resolution already cleared a motion to discharge in May. The Virginia Democrat now needs just one more Republican to approve a motion to proceed and bring his measure to the floor for debate.
Sen. Thom Tillis of North Carolina, a Republican who is not running for reelection, said Tuesday he had considered voting for Warnock's resolution and could possibly be persuaded to support Kaine's. If Tillis flips, Kaine may have his majority, though even a successful floor vote would still require the president's signature on a joint resolution.
The procedural math is straightforward. The political math is harder. Every Republican who votes to constrain the commander-in-chief during an active diplomatic process will have to explain that choice to a base that overwhelmingly supports the president's approach. The broader realignment on foreign policy, with some Democrats breaking toward the president and some Republicans breaking away, makes the next vote unpredictable.
The House concurrent resolution that passed June 3 drew support from four Republicans: Warren Davidson of Ohio, Thomas Massie of Kentucky, Brian Fitzpatrick of Pennsylvania, and Tom Barrett of Michigan. The 215-208 vote was almost entirely party-line.
But a concurrent resolution does not carry the force of law. It does not require the president's signature. It is, in practical terms, a statement of congressional displeasure, nothing more. Trump is not legally bound to comply with it.
That is why the Senate fight matters more. A joint resolution, if it ever reached the president's desk, would force a veto and a public confrontation over war powers. Democrats know this, which is why they pushed Warnock's version rather than simply taking up the House measure.
The open questions are significant. No text of the ceasefire deal has been released, so neither Congress nor the public knows the full terms. The identity of the Iranian counterpart who agreed to the arrangement has not been publicly specified. And the reasons five senators missed a vote this consequential remain unexplained.
Kaine's resolution is the next procedural flashpoint. If Tillis or another Republican moves toward yes, the Senate could face a full floor debate on war powers within weeks. Unexpected political alliances have become a recurring feature of this Congress, and the Iran debate is no exception.
But Tuesday's result is the one that matters right now. The Senate had a chance to undercut the president's hand in an active negotiation with a hostile regime, and it chose, by one vote, not to.
That vote belonged to a Democrat from Pennsylvania. The people who wanted to tie the president's hands will have to reckon with the fact that their own colleague cut them loose.
