The message is clear to every current or aspiring Republican politician: Be a toady to Trump, or you’re out.

Louisiana primary voters could boot a sitting U.S. senator for the first time in nearly 100 years. Backing the insurgency against Sen. Bill Cassidy is President Donald Trump. The…

Republican Sen. Bill Cassidy of Louisiana is fighting for his political life in Saturday's primary against a challenger who has been endorsed by President Donald Trump.