The common person's fear is that there are non-state actors out there who may deliver nuclear devices onto the North American continent. I think that's a very real concern. It's one that's worried me for years. There are so many ways it could happen. Former President Clinton used to say the easiest way to do it would be to put a nuclear weapon inside a baie of marijuana and it would get right in. It could come in pieces and be assembled here.
The first line of defence is intelligence. We should not skimp the money that we put into intelligence. That is absolutely the first line. The second line is we have to work as closely as possible with other countries to interdict any such attempts and to know what's going on out there and try to stop it from happening. Having said all that, if we don't strengthen the non-proliferation treaty and make it a worldwide instrument, if we don't get rid of the fissile material in Russia, if we don't do something about the incredibly dangerous situation in Pakistan, if we don't do something about failed and failing states worldwide, eventually it will happen.