The California Governor has sued the U.S. President over the mobilization of the National Guard, calling it “an unmistakable step toward authoritarianism.”

The swiftly evolving situation in the Los Angeles area over protests surrounding immigration enforcement actions has also cued up a public spat between President Donald Trump and Gov. Gavin Newsom, the California governor who has been one of the Republican president's most vocal Democratic critics.

President Donald Trump threatened Monday to arrest Gov. Gavin Newsom, a striking example of Trump attacking a fellow elected official just as National Guard troops deployed in Los Angeles amid protests over immigration actions.