anti-americanism at home. like the death to america chant we witnessed on our last visit to iran. that toughness may be reaping dividends at the negotiating table where robert ienhorn says iran is driving the harder bargain. >> the iranians concluded the u.s. team was under so much pressure to get a deal that the u.s. and its partners would make all the remaining concessions. >> this deadline was intended by the u.s. and ithss partners to see if a broader agreement is possible and whether iran is willing to make concessions for the agreement. this could be last-minute posturing but at a minimum they leave that question open. we need a lot of expectation management for what to expect out of an agreement if it happens. that's if it happens. >> we should know soon enough whether there's a deal or no deal. thanks very much jim sciutto