Three Republican senators broke with their party on Wednesday and voted alongside Senate Democrats to end Operation Epic Fury, marking the first real crack in GOP support for President Donald Trump's military campaign against Iran. The effort still fell short, but the fracture itself is the story Democrats have spent two months trying to create.
Sens. Lisa Murkowski of Alaska, Susan Collins of Maine, and Rand Paul of Kentucky crossed the aisle on a war powers resolution brought by Sen. Jeff Merkley, D-Ore. The measure aimed to force the removal of U.S. armed forces from hostilities involving Iran unless Congress explicitly authorized further action. It failed on a 49-50 vote, not enough to terminate ongoing operations in the Middle East.
But the margin tightened considerably from earlier attempts, and the identities of the defectors matter. Paul has consistently voted to limit executive war powers regardless of who sits in the Oval Office. Collins and Murkowski, however, represent something different: mainstream Republican senators with long institutional records who decided the administration had not made a sufficient case for continuing without congressional buy-in.
Senate Democrats have been running this play for months. Sen. Tim Kaine, D-Va., started the war powers push and has forced repeated floor votes designed to splinter Republicans from the president's position on Iran. The first such vote, back in early March, failed 53-47, with Paul the only Republican to break ranks and Democratic Sen. John Fetterman voting against the resolution.
A subsequent attempt produced the same 47-53 result. A third effort likewise went down, with Paul again the lone GOP dissenter.
Wednesday's vote changed the math. Collins and Murkowski flipped, pulling the margin to a single vote. For an administration that has argued it needs no further authorization from Congress, that trajectory should concentrate minds.
Senate Majority Leader John Thune, R-S.D., had urged his caucus to hold the line, telling reporters it "would be best if everybody hung together and supported the president." But he also acknowledged the limits of party discipline on war powers, a subject where individual senators have historically guarded their prerogatives.
"People have their own minds about some of these issues, and this is not a new vote, it's one we've had many times before, but you know, we'll see what votes are."
That's a diplomatic way of saying leadership couldn't keep everybody in line, and knew it.
Murkowski's vote did not come out of nowhere. Earlier this month, she warned publicly that unless there were signs a peace deal was nearing completion, or further communication from the administration on its objectives, she would bring an Authorization for Use of Military Force to the floor herself. That warning went largely unheeded.
During a Tuesday hearing on the president's $1.5 trillion Pentagon budget request, Murkowski pressed Secretary of War Pete Hegseth directly, asking whether it would "be helpful to the president if it was made clear that, in fact, the Congress did allow, did provide an AUMF" should fighting restart.
Hegseth's answer was telling. He said the administration's position is that the president already possesses all the authority he needs under Article II of the Constitution.
"I think the president, our view is that he has all the authorities he needs under Article II to execute."
That response may satisfy constitutional lawyers in the executive branch. It clearly did not satisfy Murkowski, who voted the next day to constrain the very authority Hegseth invoked.
Collins, for her part, had signaled her concerns earlier. She said in a statement that "further military action against Iran must have a clear mission, achievable goals, and a defined strategy for bringing the conflict to a close." Those are not the words of a senator looking to embarrass her president. They are the words of a senator who believes Congress has a role to play, and that the administration has not adequately explained its endgame.
Both Collins and Murkowski have shown a willingness to break with party leadership on other fronts as well. Their indecision on the Casey Means confirmation earlier demonstrated that these senators weigh institutional concerns heavily, sometimes at the cost of party unity.
Hanging over the entire debate is a procedural fact that should embarrass Congress as an institution: lawmakers blew past the 60-day deadline to weigh in on fighting in the region. That clock ran out while members were still maneuvering over resolutions and counter-resolutions, never reaching a definitive vote on authorization.
Top Trump administration officials argued the deadline was moot because fighting had been paused under a ceasefire. But that ceasefire is collapsing. On Tuesday, Trump rejected the latest proposal from Iran and offered a blunt assessment of where negotiations stand.
"I would say the ceasefire is on massive life support, where the doctor walks in and says, 'Sir, your loved one has approximately a 1% chance of living.'"
He was equally dismissive of Iran's offer itself, calling it "the weakest" and saying he "didn't even finish reading it." Those are not the words of a commander-in-chief preparing to wind down hostilities. They are the words of a leader who expects fighting to resume, which makes the question of congressional authorization all the more pressing.
The timing added another layer of tension. The Senate vote came hours after Trump touched down in China for a two-day summit with Chinese President Xi Jinping. Thune had noted that the trip would likely carry national security implications, making it an awkward moment for a public display of GOP division on war powers.
Kaine has been the driving force behind the Democratic strategy, and he has been candid about what he believes is at stake. He told Fox News Digital that Republicans are "actively trying to avoid accountability for the war."
He also made an argument that cuts to the heart of the constitutional debate. If an AUMF were put on the floor and passed, Kaine contended, it would transform what he calls an "illegal and unwise war" into "just an unwise war, not an illegal one." That distinction matters legally, even if it sounds like wordplay.
But Kaine was realistic about his chances of getting that vote.
"But I see almost no circumstance in which Republicans would want to have a vote on that in committee or on the floor."
He's probably right. An AUMF vote would force every senator to go on the record, for or against the war, heading into a midterm cycle where Republican leaders are already worried about internal dysfunction damaging the party's prospects. That's a vote most incumbents would rather avoid.
Some Republican supporters of the president's authority have argued the opposite, that an AUMF would actually strengthen Trump's hand by giving the military campaign explicit legislative backing. Murkowski made that very case during her exchange with Hegseth. The administration rejected the premise, preferring to rely on Article II alone.
That position has a cost. Every time the White House tells Congress its input isn't needed, it makes it easier for senators like Murkowski and Collins to conclude that the administration isn't interested in partnership, and to vote accordingly.
The 49-50 result is not a repudiation of the president's Iran policy. The resolution failed. Operations continue. But the trajectory matters.
In March, only Rand Paul crossed the line. By May, two more Republicans joined him. If the ceasefire collapses entirely, as Trump himself suggested it likely will, and casualties mount, the pressure on additional GOP senators will intensify.
The administration's confidence in its Article II authority is legally defensible. But legal defensibility and political sustainability are different things. Confidence in Hegseth and the Pentagon's direction has already shown signs of erosion among Senate Republicans on other fronts.
Congress has the option of voting on an AUMF that would either authorize or halt further fighting in Iran. That vote has not happened. What has happened instead is a series of procedural skirmishes in which Democrats force the question and most Republicans duck it, while a shrinking number of GOP holdouts provide enough cover to keep the outcome from changing.
The open questions remain significant. What is the exact mission of Operation Epic Fury? What does success look like? What is the exit strategy? Collins asked those questions. Murkowski asked those questions. The administration answered with Article II.
That answer held on Wednesday, by a single vote. The question is whether it holds next time, when the ceasefire may be gone and the stakes are no longer theoretical. Congress was designed to have a say in matters of war. Three Republican senators just reminded their colleagues of that fact. The rest of the caucus will have to decide how long they can avoid doing the same.
