Elon Musk has called for Nigel Farage to be replaced as leader of Reform UK, just weeks after reports he would donate to the party.
In a post on his social media site X, Musk said Farage "doesn't have what it takes" to lead the party.
Mr Farage suggested this was due to a disagreement over Musk's support for far-right activist Tommy Robinson. He said Musk's comment was "a surprise", but that he would "never sell out my principles".
The comment from the billionaire was posted hours after Mr Farage described Elon Musk as a "friend" in an interview on Sunday morning. He also called Mr Musk a "hero" who makes Reform UK "look cool".
Despite being a vocal supporter for Reform UK, a rift emerged recently over the Tesla founders support for Mr Robinson who is serving an 18-month prison sentence for contempt of court.
In a social media post on Sunday in response to Musk's comment, the Reform UK leader said: "Elon is a remarkable individual but on this I am afraid I disagree.
"My view remains that Tommy Robinson is not right for Reform and I never sell out my principles."