Republican Louisiana senator in tough primary after Trump backs opponent

Bill Cassidy raised ire of US president for voting to impeach after January 6 – so Trump is backing Julia Letlow

The power of Donald Trump’s endorsement will be put to its latest test on Saturday, when Louisiana holds primary elections in which the US senator Bill Cassidy, who voted to impeach the president following the January 6 insurrection, then tried to make amends by casting the pivotal vote to confirm Robert F Kennedy Jr as health secretary, stands a chance of losing his party’s nomination.

An incumbent Republican running for a third term representing a deeply Republican state, Cassidy would normally be a shoo-in for re-election. But in January, Trump abruptly said that the US representative Julia Letlow should run against Cassidy and offered his endorsement, underscoring his continued willingness to seek revenge against anyone in the Republican party who has crossed him.