California Gov. Gavin Newsom questions Trump's mental and physical ability as their clash over immigration enforcement rages on.

President Donald Trump has quashed California’s electronic vehicle mandate, accusing Gavin Newsom of trying to “kill” the auto industry and setting off another legal battle with the Democratic governor.

Hours after a federal judge sided with Gov. Gavin Newsom over Donald Trump's deployment of the National Guard in Los Angeles, an appeals court has blocked the ruling.

Gavin Newsom’s renewed control of the California National Guard didn’t last more than a few hours thanks to a federal appeals court. “The request for an administrative stay is GRANTED,” the court wrote in a short order tonight after the White House and DOJ came up short this afternoon in their bid

Gavin Newsom won praise on Wednesday for his speech Tuesday night seen by a national audience, something many Democrats saw as a shot across the bow to President Donald Trump that they can fight Trump -- and one that sparked new talk of Newsom as the party's standard-bearer in 2028.

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.

Former Attorney General Bill Barr slams Gov. Gavin Newsom’s lawsuit over Trump’s National Guard deployment, calling the claims ‘nonsense.'