The deployment of the Marine Corps -- typically deployed abroad as a rapid strike force -- is highly unusual for domestic crowd-control scenarios inside the United States.
Protests began last week after Immigration and Customs Enforcement (ICE) agents conducted raids in and around Los Angeles.
Some demonstrators breached curfews as they rallied by the downtown Federal Building and the nearby Metropolitan Detention Center, a federal prison holding immigrants.
Shortly after, on Monday, the Trump administration announced that about 700 active-duty Marines would also be sent to Los Angeles.
US Northern Command (NORTHCOM), which has responsibility over US armed forces operating in North America, said the Marines will protect federal personnel and property.
Sherman said the Marines would "hold off crowds" as needed.
But NORTHCOM said Marines could "temporarily detain an individual to stop an assault of, to prevent harm to, or to prevent interference with federal personnel performing their duties."
The Posse Comitatus Act of 1878 prevents the use of US federal troops such as Marines for domestic law enforcement activities.
It was last used during the Los Angeles riots in 1992 following the acquittal of police officers involved in the beating of motorist Rodney King.
Trump has notably not ruled out using the act.
"If there's an insurrection, I would certainly invoke it," he said this week. "We'll see."
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