Mike McCaul: “Today, ISIS is the biggest threat to the homeland.”

Senator Graham was a national security giant, a statesman of unmatched conviction, and a personal friend and mentor.

We can do both. We're a great nation. And the fact of the matter is, unfortunately, this administration has chosen not to secure the border.

I still believe, Margaret, there are many, on both sides of the aisle, a majority of the majorities in support of this.

I'm very bullish. I'm very optimistic.