years in other, 25 years of limits in other areas of this deal. for that they get a lifting of sanctions, in terms of their personal relationships, there's been so much reported about frayed tempers and people shouting. i asked both kerry and zarif whether that was true did they shout at each other. both admitted yup, there were moments of real frayed tempers, stir craziness, groundhog day. but they both said separately that after each argument they ended the day with a smile on their faces. this is a testament to how committed they were for this diplomacy to work. wolf? >> christiane thanks very much. two very important interviews in vienna today with the secretary of state of the united states, the foreign minister of iran. for our international viewers, by the way, christiane will have a lot more coming up at the top of the our on "amanpour." meanwhile, here in the united states zt the latest republican presidential candidate to weigh in on this nuclear deal with iran. our chief congressional