BRIAN STELTER (HOST): This week the revolving door between politics and television swung really, really fast. Three days after Donald Trump fired campaign manager Corey Lewandowski, CNN hired Lewandowski. He is now a pro-Trump political commentator, paid to come on the air and debate opponents and answer questions about this topsy turvy election. His hiring was instantly controversial. In fact, I would say he's the most controversial addition to CNN in several years. For one thing, he's been openly hostile to reporters all throughout the campaign, including some of CNN's own reporters.