To all of you who served in Afghanistan, you can take enormous pride in the progress you helped achieve: Driving al Qaeda out of its camps. Toppling … - Barack Obama

To begin with, Congress should act to make sure no one on a no-fly list is able to buy a gun. What could possibly be the argument for allowing a terrorist suspect to buy a semi-automatic weapon? This is a matter of national security. We also need to make it harder for people to buy powerful assault weapons like the ones that were used in San Bernardino. I know there are some who reject any gun safety measures. But the fact is that our intelligence and law enforcement agencies — no matter how effective they are — cannot identify every would-be mass shooter, whether that individual is motivated by ISIL or some other hateful ideology. What we can do — and must do — is make it harder for them to kill.

What makes me cautiously optimistic about my successor and the shift from campaign mode to governance is there’s something about the solemn responsibilities of that office, the extraordinary demands that are placed on the United States -- not just by its own people but by people around the world -- that forces you to focus, that demands seriousness. And if you’re not serious about the job, then you probably won’t be there very long because it will expose problems. Even when you’re doing a job, even when you are attentive, there are so many things that come across your desk that people are going to question you, and you’re going to have opponents and you’re going to have critics, and you figure that out pretty fast when you’re sitting there. And I think the President-elect is going to see fairly quickly that the demands and responsibilities of a U.S. President are not ones that you can treat casually, and that in a big, complex, diverse country, the only way that you can be successful is by listening and reaching out and working with a wide variety of people.

Five days ago, I traveled to Dallas for the memorial service of the officers who were slain there. I said that that killer would not be the last person who tries to make us turn on each other. Nor will today’s killer. It remains up to us to make sure that they fail. That decision is all of ours. The decision to make sure that our best selves are reflected across America, not our worst -- that’s up to us.