if, as has also been suggested, we tried to maintain unilateral sanctions, beefen them up, we would be standing alone. we cannot dictate the foreign, economic and energy policies of every major power in the world. in order to even try to do that, we would have to sanction, for example, some of the world's largest banks. we'd have to cut off countries like china from the american financial system. and since they happen to be major purchasers of or our debt, such actions could trigger severe disruptions in our own economy and, by the way, raise questions internationally about the dollar's role as the world's reserve currency. that's part of the reason why many of the previous unilateral sanctions were waived. what's more likely to happen, should congress reject this deal, is that iran would end up with some form of sanctions relief without having to accept any of the constraints or inspections required by this deal. so, in that sense, the critics are right, walk away from this agreement and you will get a better deal -- for iran. [applause] pres. obama: now, because more sanctions won't