The Insurrection Act is a federal law that allows the president to deploy the military and National Guard troops to suppress civil disorder, insurrection or rebellion. It was last used by President George H. W. Bush during the Los Angeles riots after the Rodney King verdict in April 1992.

Newsom said he believed the president was required to coordinate with the state’s governor before ordering such a deployment.

California Governor Gavin Newsom, a Democrat, told MSNBC that he plans to file suit Monday against the Trump administration to roll back the National Guard deployment, which he called “an illegal act,