“I asked John for his resignation, which was given to me this morning,” Mr Trump tweeted, adding he will appoint a replacement next week.
But Mr Bolton insisted he had quit, and vowed to have his say “in due course”.
He had disagreed with the president on a number of foreign policy challenges from Afghanistan to Iran.
Mr Bolton, who had served since April 2018, was Mr Trump’s third national security adviser after Michael Flynn and HR McMaster.
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