Trump calling the National Guard into Los Angeles should "give every American chills," a former federal prosecutor told Newsweek.

Protesters clashed with law enforcement in Los Angeles on Sunday after Trump deployed National Guard troops over the objections of Gov. Newsom.

President Trump issued a memo authorizing the National Guard to post up in Los Angeles, but California Gov. Gavin Newsom has called it "illegal."

California Governor Gavin Newsom has filed an emergency request in federal court to block the Trump administration from deploying National Guard troops and US.Marines in Los Angeles. Newsom argues that sending military forces onto city streets is unconstitutional.

President Donald Trump did not invoke the Insurrection Act in a June 7 memo that deployed the California National Guard to Los Angeles. He cited a federal law that says if the U.S. faces a rebellion, the president may call into federal service the state National Guard.

Every state has a national guard, Florida also has a state guard. What are they and can the president order them to respond? What to know.