The United States has to be a leader in the world, because the problem is: If we are not leading, nobody else will.

Al Qaeda still remains a threat.

It doesn't make a lot of sense for us to borrow money from the Chinese to go give to another country for humanitarian aid. We ought to get the Chinese to take care of the people.

An aggressor nation or extremist group could gain control of critical switches and derail passenger trains, or trains loaded with lethal chemicals.

I don't think there's any question that America is safer as a result of the bin Laden operation.

My impression is that Putin feels that he can basically manipulate the West to do what he ultimately wants to achieve, and that he feels he's gotten away with it so far, and that all he has to do is basically play the same game.

I think it's extremely important that the president Donald Trump himself indicate that he too wants to discover the full truth behind what the Russians did to elections 2016.