J.M. Berger studies the online activity of extremists. He warns that white nationalism is a growing phenomenon worldwide — with many in the movement drawing inspiration from President Trump. "When we do the social media analysis, it comes shouting out at you," he says. "We can count the links that they put out on Twitter and other social media platforms, and what we find is the most common is '#MAGA.' The most common description of somebody that they use in the profile, they use on Twitter, is 'Trump supporter.' "

Also Ken Tucker reviews Robert Forster's album 'Inferno.' Forster was the former co-leader of the Australian band The Go-Betweens.