"By calling forth troops...the President flouts the vision of our Founders," read an amicus brief filed by 21 states.

California Gov. Gavin Newsom had sued Trump in an attempt to block the deployment of federal troops in the city, which Newsom has called a “serious breach of state sovereignty.”

Senior U.S. District Court Judge Charles R. Breyer said he was “trying to figure out where the lines are drawn.”