Protests live updates: Marines make 1st temporary detention in LA

California union leader David Huerta, who has been charged with conspiring to impede an officer during a demonstration over President Donald Trump's immigration crackdown, was released Monday from federal custody on $50,000 bond.

Huerta is the president of Service Employees International Union California, which represents thousands of janitors, security officers and other workers. The union said he was arrested on Friday while observing and documenting law enforcement activity at an ICE raid in Los Angeles.

His arrest has become a rallying cry for union members nationwide and Democratic politicians who had called for his release. The SEIU held a large rally in downtown Los Angeles earlier Monday in support of Huerta. Demonstrations were also planned in at least a dozen cities, from Boston to Denver.

California Gov. Gavin Newsom reacted to the deployment of 700 Marines to Los Angeles, calling the move "un-American."

"U.S. Marines have served honorably across multiple wars in defense of democracy. They are heroes," he said in a post on X on Monday. "They shouldn't be deployed on American soil facing their own countrymen to fulfill the deranged fantasy of a dictatorial President."

New York City Mayor Eric Adams addressed the growing demonstrations in Los Angeles and across the country protesting ICE raids on Monday, saying he will accept peaceful protests but "we will not allow violence and lawlessness."

"The escalation of protests in Los Angeles over the last couple of days is unacceptable and would not be tolerated if attempted in our city," Adams said at a press briefing.

NYPD Commissioner Jessica Tisch said during the briefing that police will protect the right to protest peacefully but added, "We have no tolerance for violence. None."

Tisch said a plan is in place to use the full resources of the NYPD if needed.

-ABC News' Darren Reynolds

The National Guardsmen on active duty in Los Angeles are carrying weapons but don’t have rounds in the chamber, and they aren’t using rubber bullets or pepper spray, according to a U.S. official.

The Rules of Force that they are operating under call for them to de-escalate any incidents as much as possible, two U.S. officials said. They also have the right to self-defense.

The Marines and the National Guard personnel receiving orders to deploy to LA will operate under similar rules of force, according to two U.S. officials. That means they're tasked with protecting federal buildings and federal personnel only; they won't patrol streets, try to engage people or detain rioters on behalf of police, the officials said.

These Marines and guard personnel aren't using rubber bullets or pepper spray either, but they will carry ammunition as part of their uniforms that can be used in the rare case of self-defense, the officials said.

U.S. Northern Command confirmed Monday it has activated the approximately 700 Marines to join some 2,100 National Guard soldiers in what it is referring to as Task Force 51.

Task Force 51 forces are protecting federal personnel and property and "have been trained in de-escalation, crowd control, and standing rules for the use of force," it said.

-ABC News' Luis Martinez and Anne Flaherty