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The Louisiana Swamp

A Saturday primary will provide another test of Donald Trump's grip on the Republican party as he seeks to unseat Sen. Bill Cassidy.

Bill Cassidy
The president is intent on defeating incumbent G.O.P. Sen. Bill Cassidy, who voted to convict him after his post-January 6 impeachment. Photo: Drew Angerer/Getty Images
Leigh Ann Caldwell
May 15, 2026

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Voters in Louisiana are heading to the polls tomorrow (yes, on a Saturday) for the Senate primary, which will double as another test of President Donald Trump’s grip on the Republican Party. The president is intent on defeating incumbent G.O.P. Sen. Bill Cassidy, who voted to convict him after his post-January 6 impeachment. Cassidy, a doctor, tried to redeem himself by becoming the deciding vote to confirm vaccine skeptic Robert F. Kennedy Jr. to lead Health and Human Services, but Trump remains implacable in his thirst for revenge.