NEW ORLEANS (AP) — U.S. Sen. Bill Cassidy is fighting for his political life in Louisiana’s Republican primary on Saturday as he faces a challenge backed by President Donald Trump, the latest attempt by the president to purge the party of politicians he views as disloyal. Trump endorsed U.S. Rep. Julia Letlow over Cassidy, in an unusual attempt to dislodge an incumbent senator. Cassidy voted to convict Trump in his second impeachment trial, stemming from the attack on the U.S. Capitol on Jan. 6, 2021. Cassidy, a doctor, has also clashed with Health Secretary Robert F. Kennedy Jr. over vaccine policy, even though he provided crucial support to help Kennedy get confirmed.A third candidate is state Treasurer John Fleming. If no one gets at least 50% of the vote, a runoff will be held June 27. The winner will almost certainly take the November general election because of the state’s Republican leanings.

The election was scrambled by a recent U.S. Supreme Court decision gutting a part of the Voting Rights Act that affects how congressional maps are drawn. Although the Senate primary is moving forward, Louisiana leaders decided to delay House primaries until a future date to allow them to redo district lines ahead of time, a shift that could cause confusion for voters on Saturday.