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President Trump used his first official visit to California to talk up his planned border wall and slam both Gov. Jerry Brown and Oakland Mayor Libby Schaaf for “putting the entire nation at risk” and becoming “the best friend of criminals” for their support of sanctuary policies for undocumented residents.

When Schaaf issued a public warning last month of potential Bay Area immigration raids, it “was a disgrace to our nation,” Trump said Tuesday as he spoke to reporters at the border in San Diego.

“You have sanctuary cities where you have criminals living in sanctuary cities,” Trump said, “and then the mayor of Oakland goes out and notifies (them) when (Immigration and Customs Enforcement) is going in to pick them up.”

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He was even more specific in a tweet earlier Tuesday.

“California’s sanctuary policies are illegal and unconstitutional and put the safety and security of our entire nation at risk,” the president tweeted. “Thousands of dangerous & violent criminal aliens are released as a result of sanctuary policies, set free to prey on innocent Americans. THIS MUST STOP!”

Trump didn’t spare the governor on his first visit to the state since he was inaugurated more than a year ago. Brown “has done a very poor job of running California,” the president said. “The place is totally out of control. ... People are going to start to move pretty soon.”

Trump mentioned that he owned property in California, which includes golf courses and a home in Beverly Hills.

“Taxes are way out of whack ... double or triple what they should be,” he said.

But Trump’s main message was the country’s need for the $18 billion border wall that he promised during his campaign, a project that still hasn’t been approved or funded by Congress.

“If you don’t have a wall system, you won’t have a country,” he said after spending nearly an hour looking at eight 30-foot-high prototypes of the proposed wall near the Otay Mesa border crossing in San Diego. Trump also promised that the wall, which he originally said would be paid for by Mexico, actually would pay for itself.

“It will save thousands of lives, save taxpayers hundreds of millions of dollars by reducing crime, drug flow, welfare fraud, and burdens on schools and hospitals,” Trump said. “The wall will save hundreds of billions of dollars — many, many times what it’s going to cost.”

Following his visit to the border, the president made a speech on military preparedness to a hangar full of Marines and other military personnel at Miramar Air Station in San Diego. He then planned to go to Los Angeles for a Republican Party fundraiser that, according to the Los Angeles Times, will be held at the home of Edward Glazer, co-chairman of the Tampa Bay Buccaneers, in Beverly Park.

The president will remain in Southern California overnight.