. >> i'm marcella neville. thank you for watching. we'll see you next week. >>> president obama pushes back saying the political vacuum will not stall u.s. counterterrorism operations there. potential 2016 gop contenders at the key state of iowa, including businessman and reality tv star donald trump. my one-on-one interview with the mogul on his presidential aspirations are, will he run in 2016? >> i'm totally serious about it and i'm looking at it so seriously. to the extent that a lot of my time up here is spent thinking about that. >> hmm. plus, new developments in the fight to free an american pastor imprisoned in iran because of his christian faith. it was a meeting two years in the making. president obama sits down with sayed aborghini's wife. she sits down with us. "america's ae "america's news hq" starts right now. we begin with the latest threat from isis. world leaders condemning what appears to be the execution of one of the japanese hostages. attention is now focusing on saving the remaining captive, but as the u.s. and o