Trump showed no sign of backing down on Thursday, first taking to Twitter to accuse both France and Canada of imposing massive tariffs on US goods and then accusing Trudeau of "being so indignant".
These summits are usually seen as a cheerful and informal demonstration of shared goal and responsibility among the world's richest economies.
Cherry, who runs the Aluminium Valley Society, also said that because 80 per cent of Canadian aluminum is shipped to the US the tariffs don't make any sense for anyone.
"Because these 6 countries represent values, they represent an economic market which has the weight of history behind it and which is now a true worldwide force".
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And ahead of the summit he went on Twitter attacking the European Union and his Canadian host Prime Minister Justin Trudeau.
Canada's non-American G7 partners don't envy Trudeau, and some are downright sympathetic.
Yet rarely have these summits seen a USA leader so at odds with his fellow leaders.
There is no doubt, though, that Trudeau is upset that the USA would invoke security concerns as justification for the tariffs.
Despite the G7's efforts to coax the Trump administration away from a go-it-alone approach, some analysts now question whether Washington remains committed to basic policies that have upheld the post-World War Two global economic system.
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Macron will meet with British Prime Minister Theresa May, German Chancellor Angela Merkel and new Italian premier Giuseppe Conte on Friday at 10:30 am (1430 GMT), just before the formal start of the summit in La Malbaie. "The EU trade surplus with the United States is $151 Billion, and Canada keeps our farmers and others out", he tweeted. "Look forward to seeing them tomorrow".
"[It was a joke] to the degree one can ever take what is said as a joke", the unnamed source said, "The impact on Canada and ultimately on workers in the United States won't be a laughing matter". "We are allies. Our soldiers stand shoulder to shoulder to defend liberty and our values", Macron said.
"Don't blame Mr Trump, blame the nations that have broken away. I think the president's made that very clear". "That's the key point".
"Until we can have reciprocal relationships, we will not have free trade, and we will not have fair trade", Kudlow said.
Macron was even more emphatic, calling on the other G7 members to resist what he warned was a potential USA drift towards "further isolationism and "crude hegemony".
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This year, if members can overcome their differences on trade and Iran, the summit offers some scope for unity on issues such as girls' education, gender violence and chemical weapons. It adds the president may refuse to sign any final agreements at the summit.