Louisiana Senate Primary Results Confirmed: Cassidy Defeated; Letlow Leads With ~45%; June 27 Runoff vs. Fleming

Results from the May 16, 2026 Louisiana Republican Senate primary were confirmed on May 17. Senator Bill Cassidy — one of seven Republican senators who voted to convict Trump in the February 2021 impeachment trial — was defeated in his re-election bid, finishing third. Trump-backed Rep. Julia Letlow finished first with approximately 45% of the vote, while state Treasurer John Fleming came in second at approximately 28%, and Cassidy placed third at approximately 25%. Letlow and Fleming advance to a June 27 runoff. The result marks the first time a sitting Republican senator has lost a primary in nearly a decade, and represents the culmination of Trump's years-long effort to punish Cassidy for his impeachment vote. Trump posted on Truth Social: '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!' The result delivered a stark political message to Republican officeholders about the personal cost of crossing Trump, reinforcing MAGA's grip on the party's primary electorate entering the 2026 midterm cycle.