BURLINGAME, California — GOP frontrunner Donald Trump is speaking out against protesters burning the American flag and waving the Mexican flag in California.

Trump tweets:

Orange, California based photographer Jimmy Camp captured photos of the protesters in Burlingame, California burning an American flag.

The protesters gathered to oppose Trump, who was scheduled to speak at the California GOP Convention on Friday afternoon. Protesters also gathered the night before in Costa Mesa, California where Trump held a campaign rally.

Camp told Breitbart News some of the protesters were from progressive groups such as Free the Nipple and Code Pink.