Sir Keir previously clashed with Mr Musk in August when the billionaire claimed in a post on the X platform he owns that “civil war” was "inevitable" in Britain.
JD Vance and the Rest is Politics podcast presenter traded blows as US president’s allies continue to target British politicians.
But he accused him of insulting his voters, tweeting: “I hope your big genius is not making you patronising towards people with an IQ of 110 - since that is 75 per cent of the US population.
Mr Stewart took to X, the social media site formerly known as Twitter to describe the comments as a “bizarre take” on the bible.
Elon Musk has described Reform as the UK’s “only hope” as he stepped up his public support for Nigel Farage’s party and urged Britons to vote for it.
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