and for congress to pull back the freehand the president has had this negotiation. i think we need to go in. part of the reason we need to have this debate will become stronger as we go through this. as we talked about on this panel, the types of resources the united states needs in the region are cheap -- aren't cheap, and they aren't free. under our types of other problems we have right now particularly with the defense budget, i think conversation debate this issue understand what is in it, but also commit to understand what it means for america to have a commitments to our own interest, to her allies within the region. only by having that debate, we get stronger coming forward. mr. crowley: i think we're almost out of time. you have a closing thought? ms. laipson: it's not going to be a black-and-white story. the iranians themselves might be political backlash that hasn't been early release to the average iranian citizen. your point is at least partly correct, the other countries will abide by the agreement even if we were by a unilateral political choice to say