Experts say it's highly unusual for a president to call up the National Guard when the governor of a state objects. And Newsom is strongly in opposition.

Los Angeles residents and experts say that the National Guard's presence in Los Angeles in response to immigration protests is reminiscent of a longstanding dynamic in the state and around the country.

In announcing the lawsuit, Attorney General Rob Bonta called the president's move to federalize the National Guard an "infringement" on state sovereignty.