Mathew Burgart, center, a supporter of Republican presidential candidate Donald Trump, argues with supporters of Democratic presidential candidate Hillary Clinton before a rally with Clinton, Wednesday, Oct. 12, 2016, in Las Vegas.

Video Reveals Clinton Campaign’s Role In Inciting Violence At Trump Rallies

‘There’s a script of engagement. Sometimes the crazies bite, and sometimes the crazies don’t bite,’ says the former national field director of a group that trains and pays people to incite violence at GOP rallies.