The deployment of troops to Los Angeles raises questions about what Trump can and can't do with the military on U.S. soil, and whether he's crossing the line.

Dozens of mayors from across the Los Angeles region banded together Wednesday to demand that the Trump administration stop the stepped-up immigration raids that have spread fear across their cities and sparked protests across the U.

Most of the evening was peaceful, with a few protesters turning to vandalism in a tight area -- actions that brought police to move in closer and ultimately work to disperse the crowd.

Trump deployed 4,000 National Guardsmen and 700 Marines to LA against the wishes of Newsom and Bass. Newsom sued the Trump administration, saying they unlawfully "trampled over" California’s sovereignty when they federalized the California National Guard.

California Gov. Gavin Newsom said President Donald Trump is “pulling a military dragnet” across Los Angeles during a brief public address on Tuesday.

“Multiple groups continue to congregate on 1st St between Spring and Alameda. Those groups are being addressed and mass arrests are being initiated. Curfew is in effect,” read a post on the LAPD’s social media, sent at 9:09p.m local time on Tuesday night.

Millions to attend nonviolent protests against Donald Trump, his military birthday parade, and the crackdown on dissent in Los Angeles.

Anti-ICE protests continue in Los Angeles as the Trump administration mobilizes hundreds of Marines and National Guard members. NBC News Correspondents David Noriega, Vaughn Hillyard and Courtney Kube report on the Trump administration’s handling of the protests.