Elon Musk has said UK MPs "will be summoned to the United States of America to explain their censorship and threats to American citizens" in a fresh escalation of tensions between the world's richest man and Labour.

Musk, who has been a fixture at the side of Donald Trump since his re-election as US president, was responding to a Guardian report on Wednesday that the Commons' science and technology select committee would call him to give evidence in the new year in its inquiry into the spread of harmful content on social media after the August riots.

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X.com operates extensively in Europe. People who used the platform to instigate riots in Europe were recently prosecuted, leading the MPs to want Musk to testify about his company's activities in Europe. Rightly or wrongly, Musk believes he has the ability to cause the US government to summon MPs to the US to testify, as retribution for Europe's regulation of Musk's social media company. He thinks he's co-president.