think that an agreement is within reach? >> i believe the comprehensive deal is doable, it's possible, it's within reach. it just requires the political will and the good faith. >> reporter: which is the real voice of iran's leaders? in fact, both may be. representing the sharply divided factions for and against negotiations with the u.s. so who do you listen to then of those two? >> i think both are real. we have to see which is getting the upper hand, which has momentum behind it. i think right now many in iran are fence sitting. >> reporter: in the midst of all this new talks on a long-term nuclear agreement begin next week in vienna. i'm told there's the possibility of monthly high level meetings as these talks progress. as we hear this kind of rhetoric coming out of iran, we have to accept the possibility that there are corners, factions in iran that would like to sabotage these talks, they want to spark a reaction from the u.s., there's some method, you might