Trump exacts revenge on Bill Cassidy by backing possible Republican challenger

Trump's support of Letlow comes after Louisiana senator voted to convict president in second impeachment trial

Donald Trump has sought to deliver a staggering blow to the re-election chances of Senator Bill Cassidy - the president's fellow Republican with whom he has politically feuded - by giving his complete and total endorsement" to a potential primary opponent.

Trump's endorsement of US House member Julia Letlow as well as his encouragement for her to run for Cassidy's Senate seat in Louisiana comes after the senator voted to convict Trump in his second impeachment trial during Trump's first presidency.