Author and Dartmouth professor Jeff Sharlet has been reporting on the American right from a religious studies perspective for two decades. He talks with Brian Stelter about his forthcoming book, "The Undertow: Scenes From a Slow Civil War," and the blind spots that some members of the media have. He says it is important to understand the religious "lens" that many Americans see the world through. "If you don't have that lens, you're only telling part of the story," he says. Plus, Sharlet talks about Christian nationalism; Donald Trump's relationship with the religious right; the impact of the January 6 hearings; and how the rural-urban divide is "getting much starker." To learn more about how CNN protects listener privacy, visit cnn.com/privacy