welcome back. the white house facing strong criticism following the prisoner swap of five taliban leaders for sergeant bowe bergdahl. nicholas burns is former nato ambassador. and now a professor at the harvard kennedy school of government. ambassador, good to have you on the program. what s your take on this swap? thank you very much. i think, you know, this defies easy characterture. i think it s a difficult decision. put yourself in president obama s shoes. you have a chance to get back the loan american prisoner of the afghan war and you can understand why there would be an impulse to do that but there are some risks. there is long standing policy that we don t negotiate for hostages. i think this was extremely difficult decision.