Lawyers for President Donald Trump and California Gov. Gavin Newsom are set to face off Monday to determine whether the president violated a 147-year-old law when he deployed the National Guard to quell protests over immigration raids in Los Angeles – against the wishes of the Democratic governor.

In June, as hundreds of people gathered in Los Angeles to protest a string of immigration raids that targeted workplaces and left dozens of people detained or deported, the president federalized and deployed 4,000 National Guard members over the objection of Newsom and local officials, who said the deployment would only cause further chaos. Trump invoked a rarely used law that allows the president to federalize the National Guard during times of actual or threatened rebellion or invasion,

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