Pennsylvania Sen. John Fetterman handed the White House a critical victory on Thursday, casting the lone Democratic vote that killed a Senate resolution aimed at stripping President Trump of his authority to continue military operations against Iran. The measure failed 49-50, and Fetterman’s defection was the margin.
House Concurrent Resolution 89 would have directed Trump to withdraw U.S. armed forces from hostilities with Iran and required him to seek congressional approval before resuming military action. Because it was a concurrent resolution, it would not have needed the president’s signature to take effect. Three Senate Republicans crossed party lines to vote in favor, but Fetterman was the only Democrat to vote no.
How many daggers will Fetterman deliver to Democrats before he finally switches parties?
Fellow Pennsylvania Democrats Lash Out Within Hours
The backlash from within Fetterman’s own party was immediate. State Rep. Malcolm Kenyatta, a Philadelphia Democrat, posted on X calling Fetterman “an utter disappointment.” Rep. Chris Deluzio, who represents parts of western Pennsylvania’s Beaver and Allegheny counties, was sharper in his criticism, writing that Fetterman’s vote would “keep the Iran War raging.
“This reckless war has cost American lives, innocent lives, tens of billions of dollars, and higher prices on nearly everything here at home. John and 49 Republican Senators voted in favor of all of that,” Deluzio wrote.
Deluzio has already signaled a possible 2028 primary challenge against Fetterman, and Thursday’s vote gives him fresh political ammunition. Fetterman released no statement explaining his position after the vote, though he had appeared on Fox News days earlier to announce publicly that he would vote against the resolution, framing his support for Trump’s military authority as a matter of principle.
Thursday’s vote was not the first time the Senate acted on the question. In June, a similar resolution passed 50-48, with four Republicans, Susan Collins, Bill Cassidy, Lisa Murkowski, and Rand Paul, crossing party lines. Fetterman voted against that measure as well. At the time, Sen. Jim Risch warned that passage would derail negotiations with Tehran, saying, “If this passes, the Iranians are going to simply walk away from negotiations.” You can read more about the Senate Iran war powers vote and the broader context of the conflict as it developed.
September Vote Narrows as Republican Dissenters Hold Firm
In the September vote, four Republicans, Murkowski, Thom Tillis, Rand Paul, and Collins, joined nearly all Democrats in support of the resolution. The vote represented what analysts described as the last major legislative opportunity for Senate Republicans to break with Trump on the Iran conflict before the midterms. Most vulnerable Republican senators chose to back the president, calculating that opposing his war powers carried greater risk in a primary.
The conflict itself began on February 28, when U.S. and Israeli forces launched joint airstrikes against Iran. The strikes killed Supreme Leader Ayatollah Ali Khamenei and members of his family. By the time of Thursday’s vote, active fighting had largely subsided, though Trump told the United Nations General Assembly that he could “annihilate the Islamic Republic” if necessary.
Fetterman’s Drift From Democrats Keeps Accelerating
Thursday’s vote fits a broader pattern of breaks Fetterman has made from his party, on immigration, on Israel, and now repeatedly on Iran. He appeared at the Republican convention earlier this year while maintaining he remains a Democrat, and he has cultivated ties with conservative media figures and Republican donors. His Pennsylvania colleague, Republican Sen. Dave McCormick, voted the same way Thursday.
The resolution’s sponsor, Sen. Tim Kaine, framed the measure as a reassertion of Congress’s constitutional war-making authority. With the vote’s failure, Trump retains a free hand in Iran, and the Senate has shown no appetite to take it away. For Fetterman, the immediate consequence is a deepening rift with his base, a primary threat that grows more credible with each defection, and a silence after the vote that he has yet to break.
