The podcast “Dirty John” has captivated millions with its revelations about John Meehan, a handsome and charming man who turned out to be dangerous and deceptive. Megyn Kelly is joined by Debra Newell, who met Meehan via Internet dating, and her daughter Terra, who had a terrifying encounter with “Dirty John,” as well as by Meehan’s ex-wife Tonia Bales.