as you know, the language in the npr is called soft by some on the political right. >> i think this is a political talking point rather than a national security issue. we have said this for decades. republicans and democratic presidents have said this, we just have modernized the language to take acknowledgement that the soviet union doesn't exist. what we're telling the country is that you don't have a nuclear weapon, we're not going to attack you with our own nuclear weapons. but it's also the reverse, if you do, or if you're seen as acquiring one, like iran, then you add a greater risk. so it's against your own interests, because then we will attack you with a nuclear weapon. i think this is just a recognition of the military realities. we haven't needed to use a nuclear weapon for 65 years. in any of the wars, korea, vietnam, iraq one, iraq two. we simply don't need to use these kinds of weapons now. we have the most powerful conventional military in the world. we can make this kind of pledge without any consequence to u.s.