Former FBI Director James Comey also weighed in, tweeting Saturday night on the US-Canadian relationship.
The G7 summit came after the Trump administration announced last week to impose tariffs on steel and aluminum imports from the European Union (EU), Canada and Mexico, which has drawn strong opposition from the domestic business community and quick retaliation from USA major trading partners.
He also denied the summit had been contentious, a remark that contradicted what one G7 official described as an "extraordinary" exchange on Friday in which Trump repeated a list of trade grievances, mainly concerning the European Union and Canada.
White House officials did not immediately respond to requests for comment on the characterisations by these officials of Trump's remarks or attention to the presentations. Copies that begin "We, the Leaders of the G7" were distributed in the press room stamped "Approved".
Trump cautioned other nations -those in the G7 and around the world - that the size of the United States economy means other nations can't win a trade war. "We're like the piggy bank that everybody is robbing and that ends". I think they are starting to be committed to a much more fair trade situation for the United States, because it has been treated very, very unfairly.... I said okay, but so far we're getting nothing. On Friday, Mr Trump made a surprise call for Moscow to be readmitted, but German Chancellor Angela Merkel said other members were against the idea.
At his news conference, Trump first referred to the annexation of Crimea only obliquely. Tellingly, the desk in front of Mr Trump was bare. "You know, it's like the gig is up". But in the end there was no invitation to join the group next year in Biarritz, France, and the final communiqué called on Russian Federation to stop destabilising democratic regimes and start living up to its worldwide obligations as a member of the UN Security Council.
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At the meeting, Mr Trump's counterparts brought binders of figures to the session devoted to trade in an attempt to persuade him that his belief that the rest of the world was unfair to America was mistaken. Trump had tried to essentially splinter the European leaders by negotiating some changes with Germany and different ones with France, but those leaders appeared locked together.
"We have to keep a cool head now and draw the right conclusions", Maas said.
French President Emmanuel Macron, whose country will host next year's summit in Biarritz, said work would continue.
"We have a tremendous trade imbalance", Trump said during Saturday's press conference. That's the way it should be. "We should at least consider no tariffs, no barriers - scrapping all of it", the United States media reported Trump, as saying to the assembled leaders.
"I did suggest it", Trump said.
Trump withdrew the United States from the global deal reached in Paris in December 2015 to curb global warming, and last month from world powers' July 2015 nuclear deal with Iran, asserting that it was one-sided in Tehran's favour.