Protests surrounding immigration enforcement actions in the Los Angeles area and the Trump administration's response to them have cued up a public spat between President Donald Trump and Gov.

"By calling forth troops...the President flouts the vision of our Founders," read an amicus brief filed by 21 states.

The state of California had sought to stop the president from sending National Guard troops without the governor’s approval.

Democratic politicians have spent the last few months talking about standing up to President Donald Trump in his second term. California Gov. Gavin Newsom is among the first faced with figuring out what standing up actually looks like.

Senior U.S. District Court Judge Charles R. Breyer said he was “trying to figure out where the lines are drawn.”

California Gov. Gavin Newsom argues that President Donald Trump's unilateral deployment of that state's National Guard was illegal and unconstitutional. On Thursday night, a federal judge in San Francisco agreed,

Trump signed measures Thursday revoking waivers for the state's mandates that clean up car and truck exhaust and ramp up sales of electric vehicles. California and 10 other states immediately sued and the governor ordered the air board to craft a new mandate.

Governor Gavin Newsom claimed Trump is making up conversations about L.A. riots response while tensions escalate over deployment of National Guard and Marines in California.

A federal appeals court late Thursday paused a ruling that required President Donald Trump to return control of members of California’s National Guard to the state.

California Governor Gavin Newsom offered some cutting words on social media for President Donald Trump Thursday as he battled to retain command of the state’s National Guard. He might have spoken too soon.