"We were trying to get all of the planes down out of the sky. And we watched as the towers of the World Trade Center collapsed - something no one expected and anticipated. And you could sit there and see and be aware that thousands of people were at that moment being killed as a result of the terrorist attacks that struck the United States."
"We've gotten a long way on missile defense. We know how to do it. We know how to take down incoming warheads, but we need to do a lot more work in order to be - to deploy a system that'll defend the United States against those kinds of limited strikes that might be possible by a nuclear armed North Korea or Iran."
"I worked for George Bush. I'm proud to have worked for him. I think that a lot of the most controversial things we did, that people didn't like and - and criticized us for, things like the terror surveillance program or the enhanced interrogation techniques, were things that allowed us to save lives."
"It's not just Bin Laden or just those that are involved in the counterterrorism effort. We've gotta cast the net broader than that. But I think it's a - very special tribute that we all owe to the bravery and courage of the men and women in the intelligence and military business who performed so well to finally get it done."