I think Megyn is being generous when she says he has four viewers.
Via Mediaite:
An MSNBC host appeared on Fox News tonight. No, you’re not reading this from a parallel universe where dogs walk humans, that actually happened.Joe Scarborough appeared on Megyn Kelly‘s show to plug his new book, and the interview quickly turned into a roast where Kelly got in a few barbs at Scarborough’s expense. […]
They also went back and forth a bit about ratings, which, let’s face it, you should expect if you’re an MSNBC host going into the lion’s den. Kelly ended the segment by saying, “You want to see more of his show, you can join his four viewers.”