GOP presidential front-runner Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE on Tuesday said he would close the borders following a series of coordinated terrorist attacks in Brussels.

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“I would close up our borders to people until we figure out what’s going on,” he said on Fox News’s “Fox & Friends.”

“We have to be very, very vigilant with who we let into this country,” Trump continued. “We are taking in people without real documentation.

“We don’t know who they are or where they’re from. We don’t learn. I will tell you I’ve been talking about this for a long time. This whole thing will get worse as time goes by.”

At least 26 people died and several dozens more were wounded in bombings across Brussels early Tuesday.

Trump said Europe is facing an increasingly bloody struggle with extremist violence.

“Brussels was an absolutely crime-free city, one of the most beautiful cities in the world,” he said. “It was a magical place.

“Paris is almost as bad,” he continued, in reference to the November terrorist attacks in the French capital. “Paris is no longer the beautiful city of light. They’re cities in fear.

“This is a story that seems to be more and more happening. You see what’s happening in London and other cities. It’s not pretty to watch. Many cities will be this way with what’s taking place.”

This report was updated at 7:50 a.m.