Whether with Truth-O-Meters or Pinocchios —which the president says he doesn't like— news organizations have become ever-vigilant in monitoring for any sign of fire around political pants. Even Snopes, a website that once mostly dealt in debunking urban legends and bizarre internet claims, is now a player in serious journalism. How do fact checkers tell truth from fiction, and who fact-checks the fact checkers? We ask Glenn Kessler, writer of "The Fact Checker" column for The Washington Post, David Mikkelson, founder and CEO of Snopes.com, Yvonne Rolzhausen, head of The Atlantic's fact-checking department and Michelle Ciulla Lipkin, executive director of the National Association for Media Literacy Education. Then we're one-on-one with Senator Jeff Flake about his new book, "Conscience of a Conservative." The Arizona Republican thinks "the conservative movement and the Republican Party is being compromised by populism" and says conservatives need to find their roots — roots that don't go near President Trump.