What the judge rules, and the likely appeals that follow, may alter decades of understanding about the roles of governors and the White House in quelling domestic unrest.

An escalating clash pits a Republican president looking to fulfill his mass deportation goals against a Democratic governor with White House aspirations hoping to mobilize opposition.

A federal judge will hold a hearing on Thursday over California’s request to block the Trump Administration from using troops in Los Angeles to quell unrest sparked by Immigration and Customs Enforcement (ICE) raids as part of the President’s mass deportation effort.

Gov. Gavin Newsom posted on social media that "Commandeering a state's National Guard without consulting the Governor of that state is illegal and immoral."

California Gov. Gavin Newsom (D) has argued that the deployment is “an illegal act, an immoral act, an unconstitutional act.”

It's exceedingly rare for presidents to call up the National Guard in opposition to a governor's wishes, as President Trump did in deploying the National Guard to Los Angeles.

Trump deployed about 4,000 National Guardsmen and 700 Marines to LA against Newsom's wishes. A federal appeals court Thursday delayed an order requiring the Trump administration to return control of the National Guard to Newsom,