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.

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.

The Bureau of Alcohol, Tobacco, Firearms and Explosives has deployed its National Response Team to Los Angeles to help investigate high-profile arson cases related to ongoing protests of