President Trump has long mused about using troops to crush violent protests or riots in blue-state cities. He is now moving to do so in Los Angeles.

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.

Federal immigration officials squared off with protesters in Los Angeles County on Saturday using tear gas and flash-bang grenades. The unrest comes just a day after raids were…