Janet Napolitano: “We will learn many lessons from this attack, just as we have from past instances of terrorism and violent extremism.”

Well, I think we all ought to be quite concerned. Because as we have seen develop over time, and particularly during the last few years, words are quickly being turned over into actual violent actions.

I believe the border is secure. I believe the border is a safe border. That is not to say everything is 100 percent.

We're getting to the point of diminishing marginal returns. What would really help us is if we could improve the legal migration system so that people come through our ports of entry.

We do not see that as a barrier to achieving equality.