New Delhi, May 17 -- Republican Senator Bill Cassidy lost his bid for re-election in Louisiana's Republican primary on Saturday, marking a major political victory for US President Donald Trump and his campaign against Republicans who opposed him.

Trump-backed Congresswoman Julia Letlow and Louisiana Treasurer John Fleming advanced to a June 27 runoff after Cassidy finished in third place in the closely contested three-way race.

Cassidy became the first elected US senator since 2012 to lose renomination in a primary election.

Trump quickly celebrated the Louisiana result, portraying Cassidy's defeat as retaliation for the senator's vote to convict him during his 2021 impeachment trial following the January 6 Capitol attack.

"His disloy...