because isn't the practical deadline really mid april when congress comes back into session and gets ready to vote on legislation that you guys think will blow up the talks? >> well, i do think that the president has been very clear as said secretary kerry, the end of march is a real deadline and the choices the iranians don't have to make don't get any easier the longer they wait. we have been very clear we're not going to take a bad deal and we don't know if we will get there in the next 24 hours. we believe congress should not act while we negotiate. we should let the negotiator s do their job. if the iranians don't make the decisions they need to we can't get to an agreement here. that's what we're trying to see can map in the next day or so. >> marie, do you suggest there's not an option of extending these talks if you don't come to an agreement soon? >> well, joe, i think if we can't get to an understanding by the end of march 31st, which we've said is a real deadline,