developed very well that serve him well at this level. a one-on-one debate with donald trump would be fascinating. one-on-one with obama or clinton would be fascinating. >> i had no idea i was sitting in such the presence of a college debater. nice to see you in person. thank you very much. i appreciate it. make sure to watch the final republican debate of 2015 only here on cnn starting tomorrow night at 6:00 eastern live here from the venetian hotel in las vegas. . next president obama today making a rare visit to the pentagon revealing a a fact that the u.s. had not yet officially confirm eded about a key isis fighter. also ahead i'll speak live with a conservative writer who says donald trump is really, really a democrat and would win if he would run as one. a a trump supporter disagrees. and breaking news involving sergeant bowe bergdahl. days after e we hear his own version of events in his own words, a huge development