Cook, the first Black woman to serve on the Federal Reserve Board, responded by saying that Trump has no authority fire her and she would continue to carry out her duties.

Lisa Cook made headlines three years ago when she became the first Black woman to serve on the Federal Reserve’s Board of Governors, one of the most powerful financial institutions in the world.

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.