idea of developing nuclear weapons, in the wall street journal this morning, assistant secretary richard perle, they'd write about the nuclear deterrent, about the stockpile of nuclear weapons and they call for the u.s. to improve its stockpile. that caller was calling about an concerned about u.s. developing nuclear weapons. guest: nuclear deterrence is a part of our strategy. people are saying that it is a bit more complicated, things like developing missiles that have greater options. during the '70s we developed a doctor and called mutual assured destruction. there are many ways of going at this problem. if you want to prevent proliferation of these weapons which will make better use of them less likely. you want to maintain a deterrent force. when you are checking about terrorist groups, are they the turbo? --deterrable? can you feature them? there is concerned about us still having that capability as part of our national security as an offensive nuclear force. we have to be able to defend ourselves. you want to go out there and try to prevent their proliferation, demand for them is also