Sen. Bill Cassidy loses GOP primary in Louisiana, as two rivals advance to a runoff NBC News Top Stories By: Bridget Bowman · Brennan Leach · Melanie Zanona 17 May 2026 at 02:03 Sen. Bill Cassidy, who voted to convict President Donald Trump on impeachment charges in 2021, has lost his Republican primary in Louisiana, as two challengers aligned with Trump advanced to a runoff.Rep. © Tom WilliamsRep. Julia Letlow, R-La., at the U.S. Capitol in 2023.