Mr Trudeau's office responded by saying he had "said nothing he hasn't said before - both in public, and in private conversations with the president" and vowed to abide by the G7 final communique. In particular, Ottawa announced it would target United States steel, aluminum and other products totaling 16.6 billion Canadian dollars ($12.8 billion).
Blanchard had biting criticism for Trump, calling him a "malignant narcissist, so if you criticize him, he lashes back". "Our tariffs are in response to his of 270 per cent on dairy!"
Throughout the summit, photographers captured photos of the tension between Trump and other world leaders. Bolton wrote, "Just another #G7 where other countries expect America will always be their bank". Trump aides accused Trudeau of betrayal of Trump for his statement on retaliation.
"We have done just that at this summit, registering our deep disappointment at the unjustified decision by the USA to apply tariffs to European Union steel and aluminium imports". "And I think that's what the prime minister did today", said Jaime Watt, a Toronto-based conservative political strategist.
Trump was also furious with him for holding a press conference in which Trudeau reasserted his opposition to the US tariffs, and vowed to impose similar tariffs on USA goods. "All Canadians stand united against these inflammatory attacks on our government officials", he said. "We strive to reduce tariff barriers, non-tariff barriers and subsidies", it said, reflecting the typical language of decades of G7 statements. The non-factual part of this is - they have enormous tariffs.
"Canada does not conduct its diplomacy through ad hominem attacks ... and we refrain particularly from ad hominem attacks when it comes from a close ally", Ms Freeland told reporters in Quebec City.
The U.S. had a $17.5 billion goods trade deficit with Canada - its second-largest goods trading partner - in 2017, though it did have a goods and services trade surplus of $8.4 billion a year ago with its fellow North American Free Trade Agreement (NAFTA) member, according to data from the U.S. Trade Representative's office.
However, former USA ambassador to Canada Jim Blanchard said the auto sector in the US won't tolerate this threat of more trade action, saying that both that industry and American farmers want to see a renewed trade relationship with Canada.
The result was a slow-rolling collapse of the fragile alliances at the summit.
Reporters on Air Force One had been told the USA would sign the joint statement.
Clearly, Mr. Trump saw things differently.
Mr Trump said the United States paid "close to the entire cost of Nato" to help protect countries that "rip us off on trade".
"In a matter of seconds, you can destroy trust with 280 Twitter characters", German foreign minister Heiko Maas said when asked about Mr Trump's U-turn.
"Germany pays 1% (slowly) of GDP towards North Atlantic Treaty Organisation, while we pay 4% of a MUCH larger GDP". "We make commitments and keep to them".
"We have to prepare and we're very anxious, and should be very anxious on this side", said Charest.
"I have made it very clear to the President that it is not something that we relish doing, but it is absolutely something that we will do". But even those vested in Canadian trade are not expected to come to Trudeau's defence as long as the USA economy is roaring. $800 Billion Trade Deficit.
What has Trump said now?
British Prime Minister Theresa May, meanwhile, blasted Mr Trump's tariffs.
Media captionDairy wars: Why is Trump threatening Canada over milk?
Trump arrived late to the G-7, after letting it be known he had no desire to show up at all.
Ford also tweeted in standing "shoulder to shoulder with the prime minister and people of Canada" he said "my number one goal is to protect jobs in Ontario, starting with my unwavering support for our steel and aluminium workers".
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