President Trump said that Gov. Gavin Newsom should be arrested for his governance of California, while Mr. Newsom issued a barrage of retorts online.

Tear gas and smoke have filled the air on the southern outskirts of Los Angeles as confrontations between immigration authorities and demonstrators extended into a second day.

President Trump bypassed the authority of Gov. Gavin Newsom by sending 2,000 National Guard troops to quell immigration protesters.