entirely in the dark throughout these negotiations while stonewalling bipartisan calls for congressional oversight on a final nuclear agreement. a state department spokesman rejected that complaint. we ve had unprecedented level of cooperation, consultation and briefing with congress. reporter: a bipartisan group of former moderate senators is running a $650,000 ad campaign pressing current members who have not pledged support for the corker bill, suggesting the threat of a nuclear blast here one day. tell senators no iran nuclear deal without congressional approval before it s too late. reporter: the group has also started running ads in places like virginia thanking democrat tim kanel tim kaine for supporting the measure and in washington mike emanuel fox news. for the latest on that debate don t miss fox news sunday morning when host chris wallace sits down with senator bob menendez one of the co-sponsors of that bill so check your local