Cassidy Ousted in Louisiana Primary After Trump Campaign
Senator Bill Cassidy loses his Louisiana seat in Republican primary after Trump personally endorsed challenger Julia Letlow, marking the first GOP incumbent Senate ouster since 2017.
Senator Bill Cassidy walked out of the Louisiana Republican primary on May 16 with just 24.7 percent of the vote, his political career dismantled by President Trump's personal campaign to defeat him. The incumbent who once voted to convict Trump in his 2021 impeachment trial collected fewer than 91,000 ballots as Louisiana Republicans embraced Julia Letlow, the Trump-backed challenger who ran with the former president's full endorsement.
Cassidy's defeat sends a stark warning to Republicans who resist the former president's authority. He was the only Republican senator Trump's team actively sought to defeat this cycle, and his loss reinforces a simple reality for the party: loyalty to Trump is no longer optional.
Trump-backed Rep. Julia Letlow captured 44.9 percent of the primary vote, totaling 164,145 ballots according to Associated Press results. State Treasurer John Fleming placed second with 28.3 percent and 103,655 votes. Cassidy finished a distant third with 90,381 votes, falling short of the June 27 runoff. No candidate cleared the 50 percent threshold required to win outright.
The loss makes Cassidy the first incumbent Republican U.S. senator to lose a primary since Luther Strange's 2017 defeat in Alabama, and the first since Richard Lugar's 2012 loss in Indiana. He was one of seven Republican senators who voted to convict Trump in February 2021. Only three GOP senators who cast that vote remain: Cassidy, Susan Collins of Maine, and Lisa Murkowski of Alaska. Cassidy is now only one of two.
Trump intervened decisively on January 17, 2026, endorsing Letlow on Truth Social. She entered the race two days later. On primary day, Trump attacked Cassidy as "a sleazebag, a terrible guy, who is BAD FOR LOUISIANA." After results confirmed Cassidy's defeat, Trump celebrated: "His disloyalty to the man who got him elected is now a part of legend, and it's nice to see that his political career is OVER!"
Axios reporter Alex Isenstadt noted Cassidy was the only Republican senator Trump's team actively targeting for defeat this primary season. The distinction separates his case from other primary challenges and underscores the deliberate nature of Trump's purge.
The Louisiana vote follows a broader pattern of Trump eliminating GOP dissenters. On May 5, Trump helped dislodge five of seven Indiana state senators who rejected his redistricting plan. U.S. Rep. Thomas Massie of Kentucky faces a Trump-backed challenger in a May 19 primary. These actions establish a systematic removal of Republicans who oppose Trump at every level of government.
Cassidy outspent his challengers significantly but still lost. His campaign and allied super PACs spent roughly $21.8 million on ads, more than double Letlow's $9.8 million expenditure. Fleming spent approximately $1.5 million. Total race spending approached $35 million, according to the Washington Examiner.
In his concession, Cassidy articulated a philosophical stance Louisiana Republicans rejected. "Our country is not about one individual," he said. "It is about the welfare of all Americans, and it is about our Constitution. And it is the welfare of my people and my state and my country and my Constitution to which I am loyal."
Letlow credited Trump for her victory. "I want to say thank you to a very special man who you all know, the best president this country has ever had, President Donald Trump," she told supporters at her victory party. "Louisiana made it clear tonight: we are ready for strong conservative leadership that will stand with President Trump and never waver."
Fleming, a founding member of the House Freedom Caucus and former White House Deputy Chief of Staff under Trump, framed the race around Cassidy's impeachment vote. "The incumbent's vote to convict Mr. Trump is the number one issue in the primary," he told The Washington Times on May 14.
Louisiana's shift from an open "jungle" primary to a closed partisan primary this year shaped the contest. Governor Jeff Landry signed the change. Louisiana political analyst Robert A. Collins told The Washington Times the reform was "specifically designed to get rid of Bill Cassidy."
The June 27 runoff between Letlow and Fleming sets up what the Cook Political Report rates as a "Solid Republican" seat in a state Trump won by 22 points in 2024. Fleming represents the harder line MAGA alternative to Letlow in the runoff, positioning himself as the authentic Trump loyalist despite Letlow's endorsement.
Cassidy's defeat leaves only two Republican senators who voted to convict Trump still standing. The Louisiana result delivers a powerful deterrent to any lawmaker who might consider crossing the former president. It confirms Trump's iron grip on the Republican Party and the electoral price of dissent. But beyond the politics, one senator's career ended after a single vote—a reminder that in this era, the consequences for independence come swiftly and without mercy.