Over 1,000 people massed in America's second biggest city for a sixth day of protests, with the crowd peaceful as they marched through the streets.
"I would say for the most part everything is hunky dory right here at Ground Zero," protester Lynn Sturgis, 66, a retired school teacher, told AFP.
The mostly peaceful protests ignited over a sudden escalation in efforts to apprehend migrants who were in the country illegally.
Trump won the election last year partly on promises to combat what he claims is an "invasion" by undocumented migrants.
"We're going to have a safe country," he told reporters on his way into a theater performance.
Around 1,000 of the 4,700 troops Trump deployed were actively guarding facilities and working alongside ICE agents, said Scott Sherman, Deputy Commanding General Army North, who is leading operations.
The Pentagon has said the deployment will cost taxpayers $134 million.
His lawyers were expected in court on Thursday to demand a temporary restraining order that would prevent troops from accompanying immigration officers as they arrest migrants.
Newsom said the unprecedented militarization would creep beyond his state's borders.
Nationwide protests growing
Demonstrations were reported in St Louis, Raleigh, Manhattan, Indianapolis and Denver.
A nationwide "No Kings" movement was expected on Saturday, when Trump will attend a highly unusual military parade in the US capital.
'Inflamed' situation
But Los Angeles Mayor Karen Bass said the crisis had been manufactured in Washington.
"Things began to be difficult on Friday when raids took place... that is the cause of the problems.
Arrests by masked and armed men continued Wednesday.
When she challenged the men and asked for their badge numbers and names, they refused.
Footage seen by AFP shows what appears to be federal agents ramming a car in the Boyle Heights area of Los Angeles.
Some kind of smoke device is deployed and masked men with assault weapons order a man from the car, leaving what witnesses said was his wife and children badly shaken.
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