A fight between President Donald Trump and Democratic Gov. Gavin Newsom over the National Guard's presence in California will come to a head in a three-day trial.

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 anti-immigration enforcement protests in Los Angeles – against the wishes of the governor.

California Gov. Gavin Newsom said that President Donald Trump was making jokes with him over the phone before the president launched a military response to anti-ICE protests in California. Against Newsom’s wishes, Trump federalized the National Guard in California in response to the protests in Los Angeles. U.S. Marine troops were also sent in.

Trump’s phone call with Newsom about the Los Angeles protests in June has been under scrutiny for months. In a recent interview with MeidasTouch, Newsom revealed that during the call, Trump discussed his “Newscum” nickname for the governor, his MAGA merchandise and his debate with then-Vice President Kamala Harris.

In New Mexico’s most populous city, National Guard troops are listening to the police dispatch calls, monitoring traffic cameras and helping to secure crime scene perimeters, tasks not usually part of the job.