But European Council President Donald Tusk issued a stern warning to Mr. Trump in response: "The U.S. doesn't have and won't have a better ally than EU". "While these countries have been increasing their contributions since I took office, they must do much more".
Ahead of his first formal visit to Britain as US President, Mr Trump delivered a damning indictment of Mrs May's government saying it was in "turmoil" and Russian President Vladimir Putin may be less of a problem.
The remarks came after a Tuesday morning Twitter storm in which he repeated his frequent charge that Europe was taking advantage of the United States.
"I hope you have no doubt this is an investment in our security, which can not be said with confidence about Russian & Chinese spending", Tusk wrote. "Thank you to all of my great supporters, really big progress being made", Trump tweeted.
While countries closer to Russian Federation, such as Latvia, Lithuania, Romania, and Poland, significantly boosted defense, most other members took a more relaxed approach, with Germany's defense minister saying in 2015 that she didn't see a need to meet the spending bar, Deutsche Welle reported.
She said: "We have a tight relationship with our allies in the European Union, yet this government is tearing us away from them just as Trump is making a mockery of our so-called special relationship".
Member countries are anxious that Trump will spurn them and threaten to unravel the organization, their fears stemming from the G7 meeting last month. I would urge other (Nato members) to work towards that'.
In a number of tweets, Trump said it was "unfair" that the USA spent more on North Atlantic Treaty Organisation than other countries, as he claimed America was paying for "90 per cent of Nato".
While Mr Trump is looking to improve relations with Russian Federation, there has been alarm at the deteriorating climate with his allies in Europe and what he might agree to with President Putin. "That's up to the people, not up to me". "'And it means a lot more to you than protecting us because I don't know how much protection we get by protecting you'".
Trump has slapped tariffs on billions of dollars worth of steel and aluminum imports from China, the European Union, Canada and others, prompting retaliation against U.S. products.
The U.S. Commerce Department's Bureau of Economic Analysis website says that the European Union had a trade in goods surplus with the U.S.in 2017 of US$151.4 billion - not million.
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