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Hundreds of protesters jostled with police in riot gear Friday outside a California hotel where Republican presidential frontrunner Donald Trump was to give a speech, forcing the candidate to duck into a back entrance. Protesters broke through barricades set up around the hotel near San Francisco's international airport where the California Republican Convention was taking place. The demonstrators waved banners that read "No hate, no racism, no Trump," "We need a uniter, not a divider" and "Trump is the modern day Hitler." Several carried Mexican flags.