supply chain. the verification process set off by this deal is comprehensive and intrusive. precisely so we can make sure iran keeps its commitments. >> reporter: now, one factor complicating president obama's attempt to seal this deal to congress to congress is that there's strong opposition. before congress votes on it they get 60 days to review it. to that argument the white house is saying they won't begin implementing the plan until the congressional review period is finish. still, some lawmakers are infuriated. one calling it an affront. now spent time on capitol hill this past week. i know you've been talking to lawmakers as well alex. the president has his work cut off for him. some of his strongest supporters say that they're still not on board with this deal. they have a lot of questions about sanctions, how quickly they're going to be snapped back and about how much access those