"He's been very nice to me the times I've met him".
He said the USA "pays tens of Billions of Dollars too much to subsidize Europe" and demanded that members meet their pledge to spend 2 percent of GDP on defence, which "must ultimately go to 4%!"
Trump seems to infer that increased spending on defence by North Atlantic Treaty Organisation allies came as a result of his combative remarks in Brussels this week and previous year. She said Trump raised the topic of better burden-sharing and more spending by Germany, "as has been discussed for months", and that "we made clear that we're on the way".
Trump's comments came ahead of his summit on Monday with Russian President Vladimir Putin in Helsinki, though the Kremlin said they were unlikely to have an impact on what was always going to be a hard meeting due to the number of disagreements between the two countries.
Before anyone even arrived in Brussels, Belgium for Day One of the NATO Summit, Trump was already tweeting his allies about not putting up enough money for worldwide defense.
Remember when French President Emmanuel Macron visited the USA and got all chummy with the president?
In a series of tweets at the time, Trump said that "throughout my life, my two greatest assets have been mental stability and being, like, really smart".
In the closed-door session, Trump told his counterparts that if they did not meet their defense spending targets of 2 percent of gross domestic product by January, the United States would go it alone, according to two officials briefed on the meeting.
Trump had opened the first day of talks on 11 July with a public diatribe against Germany, the second biggest state in the Western defence alliance, criticising its reliance on Russian gas imports and failure to spend more on defence.
Trump stressed that NATO's budget had been unfair to the United States but now he was sure it would be fair.
But Macron disputed Trump's claims, saying that the joint statement the leaders had signed went no further than what had previously been agreed, apart from setting out how some countries plan to get there.
After an opening day of summit talks marked by clashes between Trump and German Chancellor Angela Merkel, NATO leaders had hoped to focus on policy on Ukraine and Afghanistan.
And the president's declaration was also directly contradicted by one of his closest personal allies, French President Emanuel Macron.
"We had a very intense summit", said Merkel. And I think that is what I'm mostly anxious about because we're not really putting the organization in a great place for the future because we're so focused on preserving what we have.
In his discussions with Europeans, Trump also complained about the expense of NATO's new $1.4 billion headquarters.
"The people voted to break it up (Britain's ties with the EU)", Trump told a press conference in Brussels on Thursday. All I can say is: "Did you?"
FORDHAM: I don't think from speaking to diplomats there that people thought it was likely, but just the suggestion that it might be possible did definitely make people nervous.
But more than half of U.S. exports go to just three countries - Mexico, South Korea, and China - and the European Commission says less than one percent of Europe's gas come from America.
"We are increasing our defence budget".
The summit's dramatic, chaotic conclusion - complete with the USA president suddenly making demands following a formal communique - bore a striking similarity to Trump's departure from last month's G7 meetings in Quebec.