New U.S. Defense Secretary Pete Hegseth, in one of his first acts in the job since being appointed by President Donald Trump, has revoked the personal security detail and security clearance for retired Army general and former chairman of the Joint Chiefs of Staff Mark Milley.

Early in his first administration, President Trump noted the general’s “brilliance and fortitude.” And then the president got angry.

Pete Hegseth told Milley, a critic of Trump, that he had ordered an investigation to determine whether his rank should be re-evaluated.