i actually think that these -- you know, there's -- my confidence has increased. i'm still not an optimist. i'm more cautious than i am optimistic but i think they're -- this is as good a shot as we will have had in the past several years to actually have a real negotiation. >> now, unnamed senior diplomatic officials are revealing that iran is poised for a huge nuclear jump greatly expanding their uranium enrichment at the fortified underground bunker and the centrifuges there are already running at up to 20% and now, according to these sources, can be reconfigured to make weapons grade material in a very short period of time. what's your reaction to that? >> i read that report and he's a good reporter. i think he may have gotten some things wrong here. they do have centrifuges that are enriching at 20%. you're absolutely right about that.