Trump Tests Grip in Louisiana Senate Primary

Bill Cassidy faces the fight of his political career as Donald Trump tries to knock him out in a Louisiana primary that would otherwise look routine.

The Republican senator, seeking a third term in a state that strongly favors his party, now confronts a challenge shaped less by ideology than by grievance. Cassidy drew Trump’s anger when he voted to impeach him after the January 6 attack on the Capitol. That break with Trump has shadowed Cassidy ever since, and reports indicate the former president moved decisively in January by urging US representative Julia Letlow to enter the race and backing her bid.

Trump has turned a normally predictable Senate primary into a loyalty test with consequences far beyond Louisiana.

The contest captures a familiar pattern in Republican politics: Trump continues to target figures who crossed him, even years ago, and uses endorsements to enforce discipline inside the party. Cassidy appears to have tried to repair the relationship, including by casting the pivotal vote to confirm Robert F Kennedy Jr as health secretary, according to the news signal. But that effort has not erased the central fact of the race: Trump wants him gone, and Louisiana voters will now decide how much that still matters.

For Cassidy, the danger lies in the mismatch between his incumbent status and the political terrain beneath him. In a deeply Republican state, an established senator usually starts with a major advantage. Trump’s intervention scrambles that logic. Instead of running as the obvious favorite, Cassidy must survive a race defined by whether Republican voters prize incumbency and experience over alignment with Trump’s demands.

The result will matter beyond one Senate seat. If Trump’s endorsement helps unseat Cassidy, it will send another warning across the Republican Party that even long-serving incumbents remain vulnerable if they defy him. If Cassidy survives, Republicans may see fresh evidence that Trump’s influence, while still potent, does not always guarantee the outcome he wants. Either way, Saturday’s primary will offer a sharp measure of where power sits in the party heading into the next round of national fights.