Mr. Tusk's challenge to the president appeared more reflective of the European Union than of Poland, where Mr. Trump is relatively popular and leaders are lobbying for a major USA military presence in their country.
Last month, the president even wrote letters to a handful of European countries, urging them to up their defense commitments. Trump to soften his rhetoric.
However, allies seem more concerned by Trump's approach than his predecessors'. "'And it means a lot more to you than protecting us because I don't know how much protection we get by protecting you'".
"We'll see how that goes", he said of the summit with Putin to be held in Helsinki on Monday.
"You can not read this any other way" than looking at whether a USA troop reduction "is a feasible option for punishing them for their apparent lack of will", said Chollet, who was the Pentagon's assistant secretary for worldwide security affairs during Obama's second term. "Who would think", the president said.
President Trump called-out European Union member states for their "big tariffs" against USA goods Tuesday, saying America loses over $150 billion in "unfair" trade with the EU as he departed for Europe.
"Thank you to all of my great supporters, really big progress being made", Trump tweeted. Today Europeans spend on defence many times more than Russian Federation, and as much as China.
"NATO countries must pay MORE, the United States must pay LESS".
EU rebukes Trump over attitude to allies
Last month, the president even wrote letters to a handful of European countries, urging them to up their defense commitments. So far, only five countries meet that threshold : the United States, the United Kingdom, Greece , Estonia and Latvia .
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He vowed not to be "taken advantage" of by the European Union, which he accuses of freeloading by relying on the United States for its defence while blocking USA imports into the bloc, the world's biggest market.
Donald Trump is scheduled to be in Brussels by late on Tuesday. Europeans must spend more on defense.
European officials say while USA defence spending makes up 70 percent of combined allied governments' military budgets, just 15 percent of United States expenditure is spent in Europe on NATO-related defence.
Of course this can't be making our European allies happy.
'When NATO has a Russian Federation council with the Ambassador from Russian Federation, we talk about the concerns that we have about Ukraine, the concerns that we have about Crimea, ' she said.
"The United States continues to devote more resources to the defense of Europe when the Continent's economy, including Germany's, are doing well and security challenges abound". In this context, Tusk and others seem concerned Putin will take advantage of the fact that Trump is not standing by key United States allies.
Before taking off for Brussels, Trump again chided fellow North Atlantic Treaty Organisation members for not contributing enough to the alliance while maintaining a trade surplus with the United States, his latest reprimand on issues that are straining transatlantic relations.
Responding to criticism from Donald Tusk, the President of the European Council, who complained that Trump is "criticizing Europe nearly daily", Trump says the United States is "being taken advantage of" by the European Union.