Three officials involved in President Trump's controversial deployment of National Guard troops to respond to protests in Los Angeles testified in court on Monday, as the trial in California Gov. Gavin Newsom's lawsuit against the Trump administration begins.

The question at issue is whether the military forces sent in by Mr. Trump — including members of the Marine Corps and National Guard — violated the 19th century Posse Comitatus Act, which bars the military from enforcing domestic laws.

Newsom called the deployment of around 4,000 California National Guard troops, who normally are under the governor's command, an illegal "power grab." But Mr. Trump argued the move was legal and necessary to protect immigration agents and federal property during tense protests against operations

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