Evangelist and Rev. Franklin Graham -- son of legendary evangelist and Rev. Billy Graham -- has listened to Donald Trump talk about his maybe-candidacy for president. And Graham likes what he hears.

"Donald Trump, when I first saw that he was getting in, I thought, well, this has got to be a joke," Graham told Christiane Amanpour in an interview set to air Sunday. "But the more you listen to him, the more you say to yourself, you know, maybe this guy's right."