Protecting America&#039s homeland and citizens from the threat of weapons of mass destruction is one of our Nation&#039s important national security challenges. Today, more nations possess chemical, biological, or nuclear weapons than ever before. Still others seek to join them. Most troubling of all, the list of these countries includes some of the world&#039s least-responsible states — states for whom terror and blackmail are a way of life. Some non-state terrorist groups have also demonstrated an interest in acquiring weapons of mass destruction. Full Story