P.J. TOBIA:

Hard statistics on white nationalist groups are difficult to come by. But the Southern Poverty Law Center says the number of hate groups in the U.S. increased by 14 percent last year.

A recent report by the Anti-Defamation League said that anti-Semitic Twitter attacks on journalists spiked early this year. Words like Trump, nationalist and white appeared frequently in the bios of users publishing the tweets. White power Web site Stormfront sees a 30 percent to 40 percent increase in traffic when Trump makes news on immigration or Muslims, according to an interview with the site's owner.

Critics charge that Trump has been slow to reject the embrace of alt-right groups and racists, including David Duke's endorsement. They also say Trump has echoed the language used by groups like Heimbach's.

DONALD TRUMP (R), Presidential Nominee: This election will determine whether we are a free nation or whether we have only the illusion of democracy, but are in fact controlled by a small handful of global special interests rigging the system. And our system is rigged. Anyone who challenges their control is deemed a sexist, a racist, a xenophobe, and morally deformed.