Transcript for Trump on Suspending Immigration From Some Countries: 'The World Is a Mess'

Reporter: Mr president, I want to ask you about refugees. You're about to sign a sweeping executive action to suspend immigration to this country. Right. Reporter: Who are we talking about? Is this the Muslim ban? We're talking about -- no it's not the Muslim ban, but it's countries that have tremendous terror. And it's countries that people are going to come in and cause us tremendous problems. Our country has enough problems without allowing people to come in, who in many cases or in some cases, are looking to do tremendous destruction. You look at what happened -- Reporter: Which countries are we talking about? I have two whole list. You will be thrilled. You're looking at people that come in, in many cases, in some cases, with evil intentions. I don't want that. They're ISIS, they're coming under false pretense. I don't want that. I'm going to be the president of a safe country. We have enough problems. Now, I'll absolutely do safe Zones in Syria for the people. I think that Europe has made a tremendous mistake by allowing these millions of people to go into Germany and various other countries, and all you have to do is take a look, it's a disaster what's happening over there. I don't want that to happen here. Now, with that being said, president Obama and Hillary Clinton have a -- and Kerry -- have allowed tens of thousands of people into our country. The FBI is now investigating more people than ever before having to do with terror. They -- and it's from the group of people that came in. So look. Look. Our country has a lot of problems, believe me. I know what the problems are, even better than you do. They're deep problems, they're serious problems. We don't need more. Reporter: Let me ask you about some of the countries that won't be on the list. Afghanistan, Pakistan, Saudi Arabia. You're going to see. You're going to see. We're going to have extreme vetting in all cases. And I mean extreme. And we're not letting people in if we think there is even some chance of some problem. Reporter: Are you at all concerned -- We are excluding certain countries, but for other countries, we're going to have extreme vetting. It's going to be very hard to come in. Right now, it's very easy to come in. It's going to be very hard. I don't want terror in this country. You look at what happened in San Bernardino. You look at what happened all over. You look at what happened in the world trade center, okay? I mean take that as an example. People don't bring that up. Reporter: Are you at all concerned it's going to cause more anger among muslims around the world? Anger? There's plenty of anger right now. How can you have more? Reporter: You don't think it will exacerbate the problem? David, David -- I mean, I know you're a sophisticated guy. The world is a mess. The world is as angry as it gets. What you think this is going to cause a little more anger? The world is an angry place. All of this has happened. We went into Iraq. We shouldn't have gone into Iraq. We shouldn't have gotten out the way we got out. The world is a total mess. The world is a mess, David. Reporter: You brought up Iraq, and you brought up something that could affect American troops in recent days. You said, "We should have kept the oil, but okay, maybe we'll have another chance." What did you mean by that? Well, we should have kept the oil when we got out you know it's very interesting, had we taken the oil you wouldn't have ISIS. Because they fuel themselves with the oil that's where they got the money. Reporter: So you think we should have taken the oil? Who are the critics that say that? They are fools. We should have taken the oil, and if we took the oil, we wouldn't have ISIS. We would have had wealth. We have spent right now, $6 trillion in the Middle East, and our country is falling apart. Reporter: What got my attenti attention, Mr. President is when you said, maybe we'll have another chance. Don't let it get your attention too much. We'll see what happens. We're going to see what happens. I told you and I told everybody else that wants to talk. When it comes to the military, I don't want to discuss things. I want to let -- I want to let the action take place before the talk takes place. I watched in mosul, a number of months ago, generals and politicians would get up and say, we're going into mosul in four months. Then they would say we're going in three months, two months, next week. Okay. And I kept saying to myself. Gee, why do they have to keep talking about going in? All right. So they go in, and it is tough because they have given the enemy all this time to prepare. I don't want to do a lot of talking about the military. I want to talk after it's finished.

This transcript has been automatically generated and may not be 100% accurate.