A White House spokeswoman said his remarks came as he was urging leaders to increase their outlays on defence and were not a formal proposal.
"I think he has to expect they're going to deny, deny everything", the South Dakotan said.
In response, the Twitter account of Russia's foreign ministry said they would be turning their attention to the World Cup instead of NATO's allegations.
Trump did not specify which countries had committed to what, and it remained unclear whether any had changed their plans.
Southgate delighted with England support after 20 years of hurt
They're playing even better than I expected - getting a score in the first five minutes was cracking. But once you're here and played as well as we did, you want to take those opportunities in life.
Trump wound up submitting to something he has eschewed on USA soil: an extensive news conference. But he noted that President Barack Obama had raised the issue in the past, securing the 2024 target date in 2014, and did so using diplomacy rather that "bombast and demagoguery".
Trump had made similar comments ahead of his visit and has always been critical of the transatlantic alliance, prompting concerns that President Trump will undermine it, CNN reported.
Republican senators who recently returned from Moscow have some advice for President Donald Trump ahead of his meeting Monday in Helsinki with Russian President Vladimir Putin: Be prepared, be careful and try not to be alone.
NATO Secretary General Jens Stoltenberg, Poland's President Andrzej Duda, Greek Prime Minister Alexis Tsipras, U.S. President Donald Trump, Portugal's Prime Minister Antonio Costa, Hungarian Prime Minister Viktor Orban pose for a group photo in the park of the Cinquantenaire, during a NATO Summit, in central Brussels, Belgium July 11, 2018. "We have to talk about the billions and billions of dollars that's being paid to the country we're supposed to be protecting you against". Most recently, he became chairman of Rosneft, which is Russia's largest oil company and controlled by the Kremlin.
Brett Kavanaugh Had Massive Credit Card Debt. The White House Blames Baseball
Chris Van Hollen, D-Md. " Kavanaugh has used the bench to undermine access to abortion for women", the Women's March tweeted. Kavanaugh has written about a need to free the executive branch from intrusive criminal investigations.
"Not acceptable!" he railed before a day of events that will include meetings with the leaders of Azerbaijan, Romania, Ukraine and Georgia before he heads to his next stop: the United Kingdom.
Trump's surprise demand came after he clashed with Chancellor Angela Merkel, calling Germany a "captive" of Russian Federation because of its gas links and singling out Berlin for failing to pay its way. I am very happy that today we are united in freedom, the Federal Republic of Germany. "All I can do is say 'Did you?' and 'Don't do it again'".
Trump leaves Brussels on Thursday for some extra time with one key member of the alliance: British Prime Minister Theresa May. "I think it's fine", he said.
He described the current situation as "disproportionate and not fair to the taxpayers of the United States".
"What's more surprising, the fact that the President Trump is calling them out on that or that previous presidents haven't?" he asked.
Adam ‘Pacman’ Jones Involved In Fight At Airport
Cellphone video footage shows that Jones and Ragin traded several punches with each other. Ragin was sent to the hospital, while Jones and the woman declined medical treatment.
"We call upon [North Korea] to fully implement its global obligations; to eliminate its nuclear, chemical, and biological warfare capabilities and ballistic missiles, and abandon all related programmes", the statement said.