Washington DC - The White House on Friday condemned Elon Musk for his "abhorrent promotion" of antisemitism, in a stunning rebuke to the X owner.

Referring to a Musk post in which he endorsed a blatantly antisemitic conspiracy theory, White House spokesperson Andrew Bates said it was "unacceptable" to repeat such a "hideous lie."

"We condemn this abhorrent promotion of antisemitic and racist hate in the strongest terms, which runs against our core values as Americans," Bates said.

"We all have a responsibility to bring people together against hate, and an obligation to speak out against anyone who attacks the dignity of their fellow Americans and compromises the safety of our communities."

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The original post – which was described by Musk as "the actual truth" – referenced a White supremacists conspiracy theory that Jews have a secret plan to bring in illegal immigrants to weaken white majorities.

Most notoriously, the idea was promoted by the man who carried out a mass shooting at a synagogue in Pittsburgh in 2018, killing 11 people.

"It is unacceptable to repeat the hideous lie behind the most fatal act of anti-Semitism in American history at any time, let alone one month after the deadliest day for the Jewish people since the Holocaust," Bates said, referring to the October 7 Hamas attack on Israel.