fox news contributor. the risk of these less destructive nukes is small or growing. what is your reaction? >> the first thing to talk about is this has been around for decades. it's a little bit misleading when they talk about these as if they are a new invention. there are definitely new enhancements. the difference between how a warhead goes off, which is the bomb part, and how you deliver on the generational divide, it has a similar yield to his head for 50 years. we had something called a davy crockett nuke that yield .78 kilotons, fraction of hiroshima and we had those in the 1950s and we brought those down from 1,000 to 200 and they are scattered around europe. it's believed that russia has 2,000 to 3,000 of what we call small nukes and president trump outfitted our summaries with variable nuclear warheads which means we could change the size of the blast but the radiation itself would remain at large.