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

California Gov. Gavin Newsom said the state is suing the Trump administration, claiming President Donald Trump illegally federalized the National Guard.

The clashes between protesters and law enforcement "is exactly what Donald Trump wanted," Newsom wrote on social media Monday morning.

"He flamed the fires and illegally acted to federalize the National Guard," Newsom said. "The order he signed doesn’t just apply to CA. It will allow him to go into ANY STATE and do the same thing. We’re suing him."

President Donald Trump in a series of social media posts said the National Guard should be brought in "right now" to help deal with protesters in Los Angeles.

"Jim McDonnell, the highly respected LAPD Chief, just stated that the protesters are getting very much more aggressive, and that he would "have to reassess the situation," as it pertains to bringing in the troops, Trump said in one post.

He added, "He should, RIGHT NOW!!! Don't let these thugs get away with this. MAKE AMERICA GREAT AGAIN!!!"

Trump was referring to McDonnell's Sunday night press conference, where he said, "this thing has gotten out of control" and would now have to make a "reassessment" about requesting the National Guard.

-ABC News' Justin Gomez

The Los Angeles Police Department has declared all of downtown as an unlawful assembly, telling all demonstrators to leave the area immediately.

"Downtown Los Angeles has been declared as an UNLAWFUL ASSEMBLY. You are to leave the Downtown Area immediately," police said on X.

"Agitators have splintered into and through out the Downtown Area. Residents, businesses and visitors to the Downtown Area should be alert and report any criminal activity," police said.

During a press conference on Sunday, Los Angeles Police Department Chief Jim McDonnell decried the escalation of violence in Los Angeles as "disgusting" as Molotov cocktails, fireworks, rocks and more were used to target officers.

Nearly 60 people were arrested on Sunday, McDonnell said, as officials attempted to disperse the ongoing protests.

"It's escalated now since the beginning of this incident," McDonnell said, calling the protests "increasingly worse and more violent."

"Tonight we had individuals out there shooting commercial-grade fireworks at our officers that can kill you," McDonnell said.

The police chief said implementing a curfew was discussed with the L.A. County Sheriff and that officials will reassess if necessary.

-ABC News' Jenna Harrison and Amanda Morris