California Gov. Gavin Newsom said Wednesday he was prepared to sue the Trump administration in a “nanosecond” if the White House moved forward with the deployment of the National Guard to San Francisco. “Send troops to San Francisco and we will sue you,@realDonaldTrump,” Newsom wrote plainly in a post on X.

A divided U.S. appeals court ruled on Monday that Donald Trump can send National Guard troops into Portland, Oregon, despite objections by the leaders of the city and state, giving the Republican pres...

The majority said the president was likely to succeed on his claim that he had the authority to federalize the troops based on a determination he was unable to enforce the laws without them.