President Donald Trump said his former secretary of state Rex Tillerson did not have the mental capacity needed.

His tweet came in response to the criticism by Rex Tillerson.

Mike Pompeo is doing a great job, I am very proud of him. His predecessor, Rex Tillerson, didn’t have the mental capacity needed. He was dumb as a rock and I couldn’t get rid of him fast enough. He was lazy as hell. Now it is a whole new ballgame, great spirit at State!

— Donald J. Trump (@realDonaldTrump) December 7, 2018

In March Trump said he will dismiss Tillerson and nominated CIA director Mike Pompeo to replace him. Trump said Pompeo shares his foreign policy view more than Tillerson.