President Donald Trump on Monday said he has fired Federal Reserve Governor Lisa Cook, according to a letter addressed to her posted on his social media — the first instance of a president firing a central bank governor in the central bank’s 111-year history.

President Trump announced he’s removing the Biden-appointed Fed Governor over alleged mortgage fraud, though critics say the move is politically motivated.

Cook, the first Black woman to serve on the Federal Reserve Board, responded by saying she has done nothing wrong and Trump cannot fire her.