Janet Napolitano: “We want to prioritize those who are criminals, those who are fugitives, those who are repeat violators.”

Climate change was one of the ``greatest challenges of our time.''

Campus sexual assault and sexual violence is a criminal issue. It is a public health issue. It is a cultural issue.

When you build a 12-foot wall, they will find a 14-foot ladder, or they will tunnel under it, or they will find other ways to get around, if we don't have a comprehensive system of identifying who is valid to be in this country and who…

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.