Senator Bill Cassidy fights for his political future Saturday as Louisiana Republicans vote in a contentious primary that tests President Trump's influence over the party. The incumbent faces Representative Julia Letlow, who secured Trump's endorsement after he branded Cassidy a "flake" and "disloyal person" for voting to convict him in the 2021 impeachment trial.

The race has become a referendum on Trump's grip within the GOP, with state treasurer John Fleming also seeking the nomination. Polling suggests Cassidy may not advance to a potential June runoff, marking a dramatic fall for a senator who previously won statewide twice. Trump has openly campaigned against Cassidy while praising Letlow as a "total winner."

Louisiana's shift to a closed-party primary for the first time since the 1970s could favor more conservative candidates, potentially disadvantaging Cassidy. The change may boost turnout among the party's base while Democrats hold a separate primary, with their nominee facing long odds in November's general election.

A Cassidy loss would signal Trump's continued dominance in Republican politics and reshape Senate dynamics heading into 2027. The outcome will influence healthcare and energy policy debates where Cassidy has played key roles.