his main arc ument in favor of the agreement is that it will reduce iran's nuclear break out time from or threements today to a year. i guess i should say extend their dark dash take longer for them to produce a nuclear weapon. to produce the material, highly enriched uranium they need for nuclear weapon. that is true in the short term. but in the long term president obama conceded that starting about 1 years break out time will reduce almost zero. >> ifill: when you testified about this to congress, you described it as a -- >> exactly. faust was a mythological figure who sold his soul to the devil in exchange for magical powers for i think 26 years. for 26 years he had magical powers, at the end of 26 years the devil came to claim his soul. and i think that is a pretty good analogy to what this deal provides for ten years, not a bad deal. after ten years it becomes a horrible deal and it gives rean everything they have always wanted. after president obama concedes after 13 years break out time is almost zero. >> ifill: when you were congestion understand aide you were party to the con