Demonstrators swarmed the California GOP convention on Friday, blocking an entrance and nearby roads.

“The "protesters" in California were thugs and criminals,” Trump wrote on Twitter on Saturday. “Many are professionals. They should be dealt with strongly by law enforcement!”

The "protesters" in California were thugs and criminals. Many are professionals. They should be dealt with strongly by law enforcement! — Donald J. Trump (@realDonaldTrump) April 30, 2016

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News cameras tracked Trump as his entourage took a back way into the building Friday, after nearby roads were blocked.

The businessman had to go around a fence and step over a concrete embankment to get through the back entrance into the Hyatt Regency hotel, where the convention took place.

“That was not the easiest entrance I’ve ever made,” Trump said after taking the stage Friday.

“My wife called and said 'there were helicopters following you.’ ... And then we went under a fence and through a fence. Oh boy, it felt like I was crossing the border, actually.”