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.

About 500 of the National Guard troops deployed to the Los Angeles protests have been trained to accompany agents on immigration operations, the commander in charge said Wednesday.

"Come and get me, tough guy. I don't give a damn," Newsom said after saying border czar Tom Homan had threatened to arrest him for speaking out on ICE raids.

President Donald Trump and California Democratic Gov. Gavin Newsom are engaged in a bitter fight over the handling of protests against Immigration and Customs Enforcement continue in Los Angeles-- and both also are framing their confrontation in familiar,