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With a handful of exceptions — North Korea comes to mind — there are few governments that have worse relations with President Trump than California. Which makes Mr. Trump’s visit to San Diego and Beverly Hills on Tuesday, his first journey to California since he became president, a particularly fraught moment.

Mr. Trump will tour prototypes of the border wall in San Diego before heading to a Republican fund-raiser in Beverly Hills. The police are girding for demonstrations. His visits here in 2016 resulted in tense clashes between protesters and police officers. When Mr. Trump delivered a speech at a Republican state convention outside of San Francisco, his motorcade path was blocked by demonstrators.

Mr. Trump devoted part of his weekly Saturday address to his unhappiness with California, echoing a suit filed by Attorney General Jeff Sessions seeking to overturn California laws that the administration said unconstitutionally blocked the White House from enforcing federal immigration statutes. “California’s leaders are in open defiance of federal law,” Mr. Trump said. “They don’t care about crime. They don’t care about death and killings. They don’t care about robberies. They don’t care about the kind of things that you and I care about.”