"Very dishonest & weak", Trump said, adding that recently imposed U.S. tariffs on imports of Canadian steel and aluminum were in response to similar measures imposed on American dairy products by Canada.
Mr Trump gave "a long, frank rant", the official said, repeating a position he carried through the 2016 USA election campaign into the White House that the United States had suffered at the hands of its trading partners, with French President Emmanuel Macron pushing back on the assertion and Japanese Prime Minister Shinzo Abe chiming in.
Echoing Trudeau, British Prime Minister Theresa May said Saturday that the European Union also will impose countermeasures to the United States tariffs.
The statement comes just a few weeks after Trump made a decision to impose large tariffs on steel and aluminum imports from the European Union, Canada, and Mexico and a few months after Trump hit the rest of the world with the same tariffs.
"If they thought they were going to lecture Trump on the glories of free trade, they got a rude awakening".
At the press conference Saturday, Trump said his administration is still renegotiating the North American Free Trade Agreement with Canada and Mexico.
He said that other countries were imposing "massive tariffs" on the US. Merkel said European Union countries at the summit agreed that the conditions to readmit Russian Federation had not been met and even Moscow seemed to reject the suggestion.
According to Trump, who blamed the US leaders who preceded him for the current trade deficits, the answer is a change in the entire global trading system.More news: Lyon say Nabil Fekir transfer negotiations with Liverpool have ended
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Trade dominated the two-day summit that began on Friday with leaders of Germany, France, Japan, Canada, Britain and Italy returning to the topic repeatedly in meetings, at a lavish dinner and by a fireside pit late into the evening.
'I think there are various discussions about alternatives that would not be that, and that would not be entirely destabilizing for a trade deal, and I think we are open to creativity, ' he said.
But in a tweet after flying out of Canada, the U.S. president showed he was in no mood to back down in any trade dispute.
The G-7 - an informal annual summit of democracies with highly developed economies - took place Friday and Saturday in the Quebec resort town of Charlevoix in Canada, which holds the rotating leadership this year.
"I guess they're going to go back to the drawing board and check it out, right?" he said, warning that if his fellow six leaders make good on their threats to take retaliatory measures, they could find themselves shut out of American markets. Trudeau said Trump's citing of "national security" as a reason for the levies being imposed was "kind of insulting" to Canadian veterans who had stood by their United States allies in conflicts dating back to World War I.
A member of Macron's team characterized the talks as "frank and robust", with Trump first repeating his lengthy diatribe about what he regards as unfair trade restrictions - before the Europeans responded with facts and figures they felt would blunt his argument.
"It may not be politically correct, but we have a world to run". President Trump is sitting alone on one side of a table.
"They do so much more business with us than we do with them ... the numbers are so astronomically against them? we win that war a thousand times out of a thousand".