the mass collection of data, it's all under court supervision and only can be used if there's credible evidence against someone who's a non-american trying to harm us. so there's adequate protections in place. we got to make sure they're enforced. >> moving to iran, senator, the supreme leader warned hardliners today, don't attack president rouhani over his attempt to mend fences with the u.s. and negotiate on nukes. do you believe there's genuine change in iran? >> there's no question iran is continuing on a path towards the development of nuclear weapons. it is very clear by their program. we hope that they will change course. we believe that the international community isolating iran has had a major impact not only on their economy but their politics. so there might be an opportunity for a change. and we'll gauge that by what we see in action. but at this point, there's no question that iran is continuing on a policy of nuclear weapon