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U.S. President Donald Trump has sacked his national security adviser John Bolton.

In a series of Tweets Tuesday afternoon, Trump said the pair had had numerous differences of opinion, and that it was time to end the relationship. Trump also suggested Bolton, known for his hawkish views, had also had disagreements with others in the administration.

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Trump said he will name a new person to the role next week, with deputy national security adviser Charles Kupperman taking over in the meantime.

Bolton was long known to have pushed Trump to be harder on North Korea, Russia and Afghanistan, and was a central player in his more hostile dealings with Iran. In fact, the president is sometimes said to have joked about Bolton: “John has never seen a war he doesn’t like.”

Among the issues said to have divided the pair were Trump’s courting of North Korean dictator Kim Jong Un, and his more recent indications that he would be open to meeting Iranian leader Hassan Rouhani.