Dozens of protesters blocked traffic near a Donald Trump event in Arizona on Saturday, while demonstrators marched in New York City to protest the GOP front-runner.<br />Protests at Trump rallies increasingly have become more contentious in recent days.<br />Friday night, protesters outside a Trump rally in Salt Lake City, Utah, tried to breach the venue's doors, causing police officers and Secret Service officers to abruptly shut them as Trump was speaking.<br />And last week, scuffles between protesters and supporters in Chicago led Trump to cancel a rally there.
