phillip, thank you very much. alisyn, let's get back to you in florida. >> joining us is democratic senator from florida bill nelsonor, we're very sorry for what's happening in your state this morning. >> thank you, alisyn. >> senator, what can you tell the american public and our viewers right now about how we're going to stop this? >> well, these are all our children. you can imagine if you were the parent of one of those children and you're looking for answers and all of the above has been talked about, the mental health, preparation at the school and so forth. but you get right down to the weapon, an ar-15. it's a high-caliber, rapid-fire, military-style weapon. it's easy available. in florida we have a background check law since 1998, but it is not enforced. and as a result it's easy to get these kind of assault weapons. so if you are one of those parents, you would be asking yourself, if it weren't an ar-15, my child might be still alive. and that's an issue that we have to confront. yet, we try something as common sense as, if you're on the terrorist watch list, you can't buy a gun, and we can't get that pas