A federal appeals court on Tuesday spent more than an hour grappling with whether President Donald Trump unlawfully federalized thousands of members of California’s National Guard to beef up security in Los Angeles amid unrest over immigration enforcement there.

A federal appeals court in San Francisco has heard arguments on whether the Trump administration should return control of National Guard troops to California.

A panel of judges on the U.S. Court of Appeals for the 9th Circuit heard arguments on whether President Trump must return control of California National Guard to Gov. Gavin Newsom.