Republican senator's vote in favor of convicting Trump after his 2021 impeachment over the January 6 Capitol siege has shadowed Cassidy throughout his second Senate term.

Sen. Bill Cassidy of Louisiana faces two challengers — one endorsed by the president — in Saturday’s primary, five years after voting to convict Trump.

Louisiana voters will participate in a revamped and stripped-down state primary Saturday and decide the political fate of an embattled Republican U.S. senator targeted for defeat…