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Police and protesters clash outside the Hyatt Regency Hotel where US Republican presidential candidate Donald Trump was speaking in Burlingame, California on April 29, 2016.  
Hundreds of protesters jostled with police in riot gear outside a California hotel where Republican presidential frontrunner Donald Trump was to give a speech, forcing the candidate to duck into a back entrance. / AFP / Josh Edelson        (Photo credit should read JOSH EDELSON/AFP/Getty Images)
Police and protesters clash outside the Hyatt Regency Hotel where US Republican presidential candidate Donald Trump was speaking in Burlingame, California on April 29, 2016.  
Hundreds of protesters jostled with police in riot gear outside a California hotel where Republican presidential frontrunner Donald Trump was to give a speech, forcing the candidate to duck into a back entrance. / AFP / Josh Edelson        (Photo credit should read JOSH EDELSON/AFP/Getty Images)

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Trump: Protesters in California were 'thugs, criminals'

Hundreds of demonstrators descended on the California Republican Convention to protest Donald Trump ahead of his speech. The GOP front-runner slammed the protesters on Twitter.

Trump: Protesters in California were 'thugs, criminals'

Hundreds of demonstrators descended on the California Republican Convention to protest Donald Trump ahead of his speech. The GOP front-runner slammed the protesters on Twitter.