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

I am in favor of creating an effective guest worker program to regain true control of the United States-Mexican border.

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

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…

We have no tolerance for it.