With Brussels, Belgium becoming the latest city to fall victim to a terrorist attack, Republican presidential candidate Donald Trump reacted to the attacks and explained how he would improve U.S. immigration policy.

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“Well, it’s a shame, it’s a horrible thing what’s going on in Brussels. It used to be one of the great places of the world,” Trump said.

“So sad to see, and as Gerry can tell you, and as I can tell you Brussels was one of the great cities, one of the most beautiful cities of the world 20 years ago, it was amazing actually, and safe. Now it is a horror show, an absolute horror show and I’m not just talking about today, I’m saying you go to Brussels it feels like an armed camp and even then they can’t do much about what’s happened,” Trump discussed with the FOX Business Network’s Maria Bartiromo and The Wall Street Journal’s Gerry Baker on Mornings with Maria.

“The reason I am leading in the Republican side by a lot, by a tremendous margin, is the fact that I’m very strong on borders. I’ve been very, very strong from the beginning,” Trump noted.

“I came out strong on trade and strong on borders, then we had the Paris attack and we started talking more in terms of military also, but we have to strengthen up our borders a lot, and with the southern border we’re going to build a wall, we’re going to absolutely build a wall. But people are coming into our country, we have no idea who they are.”

He also weighed in on the impact of the Syrian refugee crisis on the U.S. and Europe.

“The migration in Syria, President Obama is taking in thousands of people, distributing all over the United States, we don’t even know how many and nobody knows where they are going and these are people who have no documentation,” Trump exclaimed.

“If you look at what’s going on in Paris, if you look at what’s going on in, I mean Brussels we know, but look at what’s going on in Germany, who would have ever thought this was happening. And Germany is doing very poorly, I’ll tell ya I have friends that live in Germany and they want to leave, they want to get out. They say what’s happening in the streets is from a different world. So, these leaders are not very good leaders, you know she [Angela Merkel] is somebody I had a great deal of respect for, I have lost all respect,” he said.

Trump also discussed the mounting controversy over America’s visa waiver program.

“Yeah, it’s time to stop that, absolutely Gerry, and frankly look, we’re having problems with the Muslims, and we’re having problems with Muslims coming into the country, we are seeing it, whether it’s California where they killed the 14 people, the two, a young married couple, I guess she possibly radicalized him, nobody knows, she came here on a fiancé visa.”

Trump continued: “In Paris they have the toughest gun laws in the world and you have a situation there where you have 130 people just killed for no reason whatsoever.”

Trump further explained how immigration policy can be reformed to make America better as well as improve national security.

“I’m still for very strong borders, we have to close our borders, make them so strong. And let people into our country, but they have to be people that are going to be wonderful for our country. You know, we do lottery systems, I think we should do it based on merit, based on their background, have they been wonderful people where they were. We’re taking people into our country we know nothing about it.”

The GOP frontrunner then raised specific concerns about the handling of Syrian refugees.

“And the most serious version of that is what’s coming in from Syria. We’re taking in people with zero documentation and I can tell you I’ve talked to every law enforcement’s top people, there is no way you can tell anything about these people from documentation, because it is all gone. Yet it’s a strange thing, they have no documentation, no anything, yet they’re walking into a migration line, young men using cell phones.