A high-stakes trial began Monday in a California courtroom over whether the Trump administration violated federal law when it deployed thousands of National Guard troops and United States Marines to Los Angeles following protests over immigration raids in June.

A three-day trial opened Monday in state officials’ challenge of the legality of the deployment, which followed protests over immigration raids.

SAN FRANCISCO (AP) — A federal judge in San Francisco will consider evidence and hear arguments on whether the Trump administration violated federal law when it deployed National Guard soldiers and U.S. Marines to Los Angeles following protests over immigration raids this summer.