Tensions are escalating in Los Angeles after protests against Immigration and Customs Enforcement gripped the city on Sunday, with demonstrators clashing with law enforcement and setting vehicles on fire downtown.

California sued the Trump administration on Monday over its decision to send in National Guard troops in response to protests over immigration enforcement, calling it an unconstitutional use of executive power that usurped the state’s authority.

The last time the National Guard was activated without a governor’s permission was in 1965, when President Lyndon B. Johnson sent troops to protect a civil rights march in Alabama.