"Germany, as far as I'm concerned, is captive to Russia because it's getting so much of its energy from Russia", Trump told Nato Secretary-General Jens Stoltenberg in a fiery on-camera exchange that was among the harshest in the history of the post-World War II alliance.
Mr Trump said: "Germany is a captive of Russian Federation".
He also once again called for other North Atlantic Treaty Organisation countries to "immediately" increase their own defense spending to 2 percent of their national gross domestic product, a target that alliance members had previously agreed to aim to meet by 2024.
Trump called Germany a rich country that could increase its defense spending immediately if it wanted to.
USA officials have told Reuters Washington is preparing another review of strategy, a year after Trump begrudgingly agreed to extend involvement in the 17-year-old war.
Trump did not say 70 to 90 percent of what.
"So, we're protecting Germany, we're protecting France, we're protecting all of these countries". The US is paying for Europe's protection, then loses billions on Trade.
A joint declaration said: "We are committed to improving the balance of sharing the costs and responsibilities of alliance membership".
"The alliance is very important and I think there's ways of communicating our displeasure with things without trying to insult and break the alliance apart", said Corker. The former chancellor of Germany is the head of the pipeline company that's supplying the gas. So you tell me, is that appropriate?
"It should have never been allowed to have happened". The pipeline, set to become operational in 2019-2020, will run from Russian Federation to Germany (Ust-Luga to Greifswald) and double the pipeline capacity between the two nations.
Mr Trump has been pressing member countries to spend more on defence, accusing them of passing the burden on to the US. "But other presidents never did anything about it because I don't think they'd up it or wanted to get involved", Trump said. "I have to bring it up because it's unfair to our country or our taxpayers".
What gas deal was Trump referring to? German Chancellor Angela Merkel has said her government will increase spending to 1.5% of GDP by 2024.
For U.S. President Donald Trump, a summit with Vladimir Putin risks a political backlash at home and overseas.
Kremlin critics at home and overseas see Trump's decision to grant Putin a summit against that backdrop as conferring worldwide legitimacy and status on Putin, something they say he doesn't deserve given the lack of meaningful change in Russia's policies internationally.
Leaders will be keen to hear more about Trump's military approach to Afghanistan, which he revamped last August to include a surge in air strikes to force Taliban militants to the negotiating table.