He complained the United States "pays tens of Billions of Dollars too much to subsidize Europe" and demanded that member nations meet their pledge to spend 2 percent of GDP on defense, which "must ultimately go to 4%!"
As per The Hill, President Trump has attacked EU ahead of the summit, while alleging that the Europeans have taken advantage of the USA on trade issues while failing to invest enough into their own defense for years.
It followed an uncomfortable first round at the summit where anxious Western allies were subjected to the US president's "America first" approach.
Trump told NATO Secretary-General Jens Stoltenberg that Germany was wrong to support a new Baltic Sea pipeline to import Russian gas while being slow to meet targets for contributing to NATO defence spending meant to protect Europe from Russia.
It is not yet decided whether they will meet at the Kremlin or at the stadium where France is set to play the victor of Wednesday night's semi-final between England and Croatia, the aide said. "It's really extraordinary that Donald Trump has to be the person to point out that the emperor in Europe has no clothes". Energy exports represent Russia's main source of revenue, and Trump argues that the pipeline undermines NATO's goal, as it's created to counter Russian aggression.
"We are not prisoners, neither of Russian Federation nor of the United States", Germany's Foreign Minister Heiko Maas told reporters.
Trump was due to meet German Chancellor Angela Merkel and French President Emmanuel Macron later on Wednesday.
Sen. Lindsey Graham, R-S.C., said he thinks the president is "right about Germany buying gas from the Russians, that's counterproductive".
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Trump claims the U.S. is already spending the equivalent of four per cent of its GDP on defense, but experts say the actual figure is 3.57 per cent.
"We're protecting Germany, we're protecting France, we're protecting all of these countries".
Trump told Stoltenberg Germany was wrong to support an US$11-billion Baltic Sea pipeline to import even more Russian gas while being slow to meet targets for North Atlantic Treaty Organisation spending.
Stoltenberg agreed there should be more done to prompt allies to invest more in their defense.
Mrs Merkel told reporters: "I am very happy that today we are united in freedom as the Federal Republic of Germany".
Trump had "very direct language" but "when it comes to the core message we actually all agree", Stoltenberg later said. "He may be the only one, but that's OK with me".
Trump's next stop will be London, where he'll be meeting with Queen Elizabeth II and British Prime Minister Theresa May.
Trump predicted as he departed Washington that the "easiest" leg of the journey would be the sit-down with Putin - a comment that did little to reassure allies fretting over his potential embrace of a Russian leader they regard as hostile.