At the Republican Party’s recent state convention near Palm Springs, Brad Parscale, Mr. Trump’s campaign manager, said, “the Trumps will be a dynasty that will last for decades.” But the cloud of Mr. Trump’s unpopularity in California hung over the convention, and a successful resolution pushed by Chad Mayes, a Republican lawmaker and critic of the president, that called on the party to condemn racism and xenophobia was seen as a rebuke of the president.
Mr. Trump himself has a checkered history with California. Hollywood never warmed to him as an entertainer, and in the 1990s he failed to build what he promised would be the world’s tallest building in Los Angeles. After he became president, a flash mob of protesters descended on his golf resort in Palos Verdes, spelling the word “resist.” And during several campaign stops in April and June 2016, before the Republican primary, he drew thousands of supporters to rallies — and also hundreds of protesters.
In April of that year, protesters temporarily blocked Mr. Trump from entering the Hyatt Regency Hotel in Burlingame, Calif., where he was scheduled to speak at the state Republican convention. He was forced to exit his motorcade and make his way off Highway 101 by foot. “That was not the easiest entrance I’ve ever made,” he told the audience. “I felt like I was crossing the border.”
But when he came to visit after the wildfires last year, he was welcomed to Paradise, Calif., by former Gov. Jerry Brown, Mr. Newsom and local officials.
Last year, Manuel Pastor, a sociologist and professor at the University of Southern California, wrote a book about the conflict between Mr. Trump and California, called “State of Resistance.”
Asked how he would update his book now, he said, “the conflict between the federal government, the Trump administration, has deepened. And California has gotten increasingly better at being able to defend itself and resist. And the Trump administration has gotten increasingly creative about ways that it could shortchange California.”