Cameras tracked Trump as his entourage took a back way into the building. 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 is taking place.

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

“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.”

Protesters blocked off roads leading to the convention site in Burlingame as police guarded the front entrance to the building. Friday was the second consecutive day Trump has faced protests in Southern California.