When asked if Europe’s migrant crisis is a national security threat for the United States, Former UN Ambassador and AEI scholar John Bolton said, “Oh, I think it is, and I think it’s already a national security issue for Europe,” during an interview with Breitbart News Daily host Stephen K. Bannon.

Bolton added, “I think you could possibly see the results of this in the British referendum in June on whether they’re going to stay in the European Union, or not. They’ve seen what happened in Paris in November. Then back in January of 2015. They saw what happened in Brussels just last week. They’ve seen people pushing to get on the trains coming in the tunnel under the English Channel. And I think they already have their own domestic difficulties in the UK, and it’s going to have an effect on that referendum. And I think it is on elections all over Europe.”

Commenting on the immigration discussion in Europe, Bolton said, “There’s a philosophy out there and it’s the kind of conventional wisdom on the International Left that International borders, you know, they’re just kind of there and really people should be allowed to go anywhere they want. They don’t like to say that so expressly publicly. And I guess I’m exaggerating for effect to an extent, but the notion that a given nation — a Spain — can be filled with, I know this is anachronistic, Spanish people, is something that they reject. So, if you live in the Middle East and want to live in Germany, why not?”

When asked about America’s southern border, Bolton said, “I think that after decades of being lectured by our friends in Europe about out attitude toward illegal immigration, they’re now seeing the chickens come home to roost. I think citizenship is a critical concept in a democratic society and America has, over the years, because of our melting pot phenomenon, our ability to integrate people from all over the world — it’s our national motto E Pluribus Unum — it has made us the greatest country in history. If you abandon that and say that citizenship is for anybody that happens to be on our side of the border, you’re destroying this experiment. And the consequences will come sooner than later, and they will be negative in their entirety.”

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Listen to the full interview below: