Nikki Haley, a leading contender for the Republican presidential nomination in 2024, has turned on Donald Trump, saying she was "disgusted" with the former president.
Haley, Trump's ambassador to the United Nations, said he had "let us down" and "fallen so far". The former governor of South Carolina has long been seen as a potential Republican nominee in four years, and started a political action committee last month.
Her comments set up a clear fissure in the Republican party as other would-be candidates, including Ted Cruz and Marco Rubio, looked set to seek backing from Trump's followers. Both senators are expected to vote to acquit Trump at the end of his impeachment trial.
In an interview with Politico, Haley disclosed that she had not spoken to Trump since his supporters stormed the US Capitol on January 6. She did not believe Trump himself would run for the nomination in 2024, claiming he was no longer a "viable" candidate.