"Look, I’m not naïve. I know tragedy will come again. It cannot be forever overcome. It cannot be fully understood either. But there are certain things we can do. We can keep assault weapons off our streets. We’ve done it before. I did it when we passed the crime bill last time. And violence went down, shootings went down. You can’t prevent people from being radicalized to violence, but we can address the relentless exploitation of the Internet to recruit and mobilize terrorism. We just need to have the courage to do that, to stand up."