CBS anchorman Jeff Glor had asked the president who he thought was the nation's "biggest competitor" or "biggest foe".
"You're supposed to be fighting for someone and then that someone gives billions of dollars to the one you're, you know, guarding against, I think it's ridiculous, so I let that be known also this time", Trump said. "I think the European Union is a foe, what they do to us in trade", Mr Trump told CBS's "Face the Nation".
He added: "You wouldn't think of the European Union, but they're a foe". Naming the Kremlin in his list, Trump said, "Russia's a foe in certain respects". China is a foe economically, certainly they are a foe - but that doesn't mean they are bad. But that doesn't mean they're bad. "It means they are competitive", he said. "But, in a trade sense, they've really taken advantage of us and many of those countries are in North Atlantic Treaty Organisation and they weren't paying their bills".
"Germany's like sitting back silent, collecting money and making a fortune with probably the greatest leader in the world today, Merkel", Trump said in a 2015 interview with USA news magazine Time.
"America and the European Union are best friends", Tusk wrote.
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"The E.U.is very hard", Trump began. His mother was born in Scotland, while his father was born in NY.
Trump repeated his previous assertion that the European Union has "really taken advantage of us on trade".
In the interview, Trump also continued his assault on Germany that he began during the two-day North Atlantic Treaty Organisation summit on Brussels earlier in the week, calling out the country for a pipeline deal with Russian Federation.
President Trump in Turnberry, Scotland, on July 15.
John Bolton, Trump's national security adviser, said in an interview with ABC's "This Week" that the United States would not be looking for "deliverables" and that the meeting would be "unstructured", beginning with a one-on-one session between the two leaders. Trump will take part in a one-on-one summit with Russian President Vladimir Putin in Helsinki, Finland, on Monday.
A trade war between China and the United States escalated last week after China imposed retaliatory tariffs on $34 billion of mostly U.S. agricultural products.