"You know, without much, if any, regulation," he continued. "They can buy it over the Internet, they can buy machine guns. And for me, having to speak to parents who have lost a child, just two days or a day after it had happened, and not being able to assure them that that would change, that we would fix this — I couldn’t bring their children back, but I couldn’t even promise them that we would change the law so this didn’t happen to somebody else’s children."