they have to make sure that they are making their own assessments about what they need to do to protect themselves. and we respect that and i've said that consistently to the prime minister. but ultimately, it is my view from a tactical perspective that we have to test out this proposition, it will make us stronger internationally. and it may possibly lead to a deal that we'll have to show to the world, in fact, assures us that iran's not getting a nuclear weapon. it's not as if there's going to a lot of capacity to hide the ball here. we're going to be able to make an assessment because this will be subject to the p5-plus-1 and the international community looking at the details of every aspect of a potential final deal. and we're consulting with all our friends, including israel in terms of what would that will