Trump-Backed Letlow Tops Louisiana Senate Primary After Cassidy Defeat

Republican voters in Louisiana delivered a clear signal on Saturday that opposition to Donald Trump carries a steep price inside the party. Sen. Bill Cassidy finished third in the GOP primary and will not advance, leaving Rep. Julia Letlow and state Treasurer John Fleming to compete in a June runoff for the seat. The outcome follows Cassidy’s 2021 Senate vote to convict Trump in his second impeachment trial and underscores the former president’s continued sway over primary voters.

Letlow, who received Trump’s endorsement, led the field while Fleming placed second. Cassidy had relied on a large campaign fund and crossover support from non-Republican voters, but those advantages proved insufficient once the primary was closed to party members only. Trump posted on Truth Social that Cassidy’s “disloyalty to the man who got him elected is now a part of legend,” while Cassidy, in his concession remarks, said insults from people lacking “character and integrity” did not bother him.

The same evening Trump expanded his focus to Rep. Thomas Massie of Kentucky, urging voters to defeat him in Tuesday’s primary and labeling him “the worst and most unreliable Republican Congressman.” Trump also threatened to withdraw his endorsement of Rep. Lauren Boebert after she campaigned with Massie, though filing deadlines in Colorado had already closed. Sen. Lindsey Graham told NBC’s Meet the Press that Cassidy’s loss showed “there’s no room in this party to destroy” Trump’s agenda.

Letlow benefited from Trump-aligned spending, including $1 million from the Make America Healthy Again PAC, which cited Cassidy’s resistance to certain Trump health nominees. Louisiana Gov. Jeff Landry also backed Letlow and supported changes that limited Cassidy’s access to Democratic-leaning voters. Pre-runoff polling showed Letlow ahead of Fleming, though both candidates now compete for the same Trump-aligned electorate.

Cassidy continues to serve as a lame-duck senator and chairs the Senate HELP Committee, where he has already blocked several nominees. His defeat leaves other Republicans weighing the electoral risks of crossing Trump before the midterm elections.