flynn's peers felt he'd gone over a line. >> as you said, you cannot overstate the importance of this choice as, you know, the western world and many in the middle east continue to battle isis, et cetera. critical choice, especially for a president who has no military experience. peter, fascinating piece up on cnn.com. thank you very much. >> thank you, poppy. coming up, live in the cnn newsroom, any moment, you will hear from president obama. his final international news conference ahead tonight, live from lima, peru. of course, we watch who will show up next at the door to meet with president-elect donald trump as he fills his administration. up next though, the vice president elect and the president-elect, not getting along well with the cast of a broadway hit show. "hamilton." the latest on that. the president-elect tweeting about it again today. also, he's back. >> what is isis?