"It is entirely possible that these two attackers were radicalized to commit this act of terror. And if so, it would underscore a threat we’ve been focused on for years — the danger of people succumbing to violent extremist ideologies. We know that ISIL and other terrorist groups are actively encouraging people — around the world and in our country — to commit terrible acts of violence, often times as lone wolf actors. And even as we work to prevent attacks, all of us — government, law enforcement, communities, faith leaders — need to work together to prevent people from falling victim to these hateful ideologies. More broadly, this tragedy reminds us of our obligation to do everything in our power, together, to keep our communities safe. We know that the killers in San Bernardino used military-style assault weapons — weapons of war — to kill as many people as they could. It’s another tragic reminder that here in America it’s way too easy for dangerous people to get their hands on a gun. For example, right now, people on the No-Fly list can walk into a store and buy a gun. That is insane. If you’re too dangerous to board a plane, you’re too dangerous, by definition, to buy a gun. And so I’m calling on Congress to close this loophole, now. We may not be able to prevent every tragedy, but — at a bare minimum — we shouldn’t be making it so easy for potential terrorists or criminals to get their hands on a gun that they could use against Americans."