Kevin Rudd's savage criticism of Donald Trump has come back to haunt him during a high-stakes meeting between the US president and Prime Minister Anthony Albanese.

During the White House meeting on Tuesday where Australia and the US agreed to a multi-billion dollar critical minerals deal, Mr Trump was asked about old social media posts from the Australian ambassador attacking the president.

Mr Rudd previously called Mr Trump a traitor to west and the "most destructive president in history" before he took on the ambassadorial role in posts that have since been deleted from social media.

When asked about the stinging criticism, Mr Trump said he didn't know anything about the ambassador.

"If he said bad, maybe he'd like to apologise. Don't tell me. I don't want to know," he said.

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