“The district court has no authority to usurp the president’s authority as commander in chief,” Kelly said in an emailed statement to the Southern California News Group. “The president exercised his lawful authority to mobilize the National Guard to protect federal buildings and personnel in Gavin Newsom’s lawless Los Angeles.”

Their clash over Trump’s deployment of military forces for anti-ICE protests in Los Angeles is far from the first time the two leaders have butted heads.