We used to have plenty of them of course but we destroyed all of them to abide by treaties. But. I'm troubled by the U.S. not having at least some chemical weapons allowing us to "retaliate in kind" against a chemical weapons attack. For example if the North Koreans invaded South Korea and used their chemical weapons against South Korean and American military targets, the only way the U.S. could retaliate would be to use nuclear weapons. I think everyone would agree that using nuclear weapons is a bad idea even against a nation that has used chemical weapons. So how quickly could the U.S. build more chemical weapons in order to deter a potential chemical weapons attack on the Korean peninsula or elsewhere?