Donald Trump is a great listener, and he's a good challenger. He doesn't come across as a person who thinks he knows it all. In fact, he once told me he has had lot of things to learn.

Why do three-quarters of NATO [countries] get away with not paying anything? They have to pay their bills.

I believe there's a diseased component inside the Islamic world, the Muslim world, absolutely. It's like a cancer and it has metastasized and grabbed hold in a much bigger way, and it's because we, have tried to be, globally, tried to be so political correct.

There are Muslims, who are moderate Muslims. And there's more of them than there are radicalized Muslims and are using Islam in its misinterpreted ideology.

I think all of Europe has been too soft on the refugee crisis.

When you look back, history is not going to be kind to these last 16 years from 2000 to 2016.

Obama's decision to leave, to not sustain the victory that resulted after eight years of fighting, from 2003 to 2011 in Iraq, was another incredibly stupid decision. It was totally based on politics, not based on any notion of national security. It's a nightmare for our national security. And then you have the Libya intervention.