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US President Donald Trump says he had warned his EU partners that “immigration is taking over Europe” during a NATO summit in Brussels.

Trump made this known to reporters on the sidelines of a NATO summit on Thursday.

“Immigration is a very important thing and I told them today, the EU, the European Union, better be a very careful because immigration is taking over Europe and they better be very, very careful. I said that loud and clear.”

He added that he was still committed to NATO despite fierce criticisms of allies over their defence spending commitments.

“The US were not treated fairly but now we are. I believe in NATO,” Trump told a press conference after a fraught NATO summit in Brussels.

“The US commitment to NATO remains very strong,” Trump added, “mainly because (of) the additional money they’ve committed.”

Trump’s comments came amid reports that he had warned leaders at an emergency session that the United States could pull out of the alliance if other members failed to increase their contributions.

Trump said there had been “tremendous progress” and that allies were “going to up it at levels they’ve never seen before.”