>> reporter: clinton said trump was building a campaign steeped in conspiracy theories. trump responded she is fear >> there has been a steady stream of bigotry coming from him. >> reporter: clinton came armed with examples. like trump's comments about hispanics and muslims. >> he'd ban muslims from around the world entering our country because of their religion. >> donald j. from isal muslims entering the united states. >> reporter: she said his conspiracy theories followed a pattern. >> he promoted the racist lie that president obama is not really an american citizen. >> if you are going to be the president of the united states. you have to be born in the id, have reinforced offensive stereotypes. >> what do you have to lose the it? cannot get any worse? >> it really does take day lot decades what do you have to lose? because the answer is -- everything. >> reporter: clinton argued, trump's views line up with the alt-right. an obscure movement online.p>> paranoid fringe in our...