Louisiana’s Republican Senate primary is shaping into a test of whether President Donald Trump’s endorsement still decides elections or whether candidates can survive by borrowing the Trump agenda without his political backing.

Sen. Bill Cassidy (R-LA) faces two challengers in the May 26 primary, with the possibility of a June 27 runoff if no candidate wins at least 50%: Rep. Julia Letlow (R-LA) and state Treasurer John Fleming.