Sen. Cassidy Loses Louisiana GOP Primary as Trump-Backed Rep. Letlow Advances to Runoff

Letlow and Fleming face a runoff election on June 27.

Rep. Julia Letlow (R-La.) speaks during an Election Day party for her at MMR Headquarters in Baton Rouge, La., on May 16, 2026. Kathleen Flynn/Getty Images

Rep. Julia Letlow (R-La.) and Louisiana Treasurer John Fleming ousted incumbent Sen. Bill Cassidy (R-La.) in the Republican primary election in Louisiana on May 16.

Letlow won more than 44.8 percent of the vote, while Fleming received 28.3 percent and Cassidy received 24.8 percent, according to the results after 99 percent of the votes were tallied.