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Donald Trump has moved to oust Lisa Cook, a governor at the Federal Reserve, in his latest attack on the American central bank.

It is an unprecedented intervention by a US president, which threatens to undermine the independence of the central bank of the biggest economy in the world.

Trump posted a letter on his social media platform Truth Social on Monday, claiming he had “sufficient cause” to fire Cook, based on allegations she made false statements on one or more mortgage loans.

Cook, who is the first black woman to serve on the Fed Board in Washington, has sad that Trump has no authority to fire her and that she will not quit.