The prime minister's silence on Monday came in sharp contrast to a roar of disapproval among Canadian politicians, who banded together across party lines to denounce Trump's attack and praise the bilateral and trading relationship between the two neighbours.
But before the group could sign off on a joint statement of agreement on trade talks, Trump's advisers reportedly insisted that the USA would not agree to two key points in the statement related to the environment.
Hayden added that the display reminded him of Sean Spicer lying about crowd sizes in a press briefing after Trump's inauguration: "He did it for personal survival", Hayden said.
She said that the European countries will not be "taken advantage of" in terms of trade and that they would "act" against the US trade measures, which are considered as going against the World Trade Organization's rules.
Trump and Trudeau have been at odds ever since the United States announced in late May that Canada will no longer be exempt from steel and aluminum tariffs, a decision that Trudeau described as "totally unacceptable".
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In response to Mr Trump's decision to withhold U.S. support for the summit conclusions, a senior United Kingdom government source said: "We stand by the commitments made in the G7 communique".
"As Canadians, we are polite, we're reasonable, but also we will not be pushed around,"Trudeau said". Earlier that day, Trump also tweeted: "Please tell Prime Minister Trudeau and President Macron that they are charging the USA massive tariffs and create non-monetary barriers".
Protective measures like Canada's dairy tariff are common around the world.
After Trump departed for Singapore for a highly anticipated meeting with North Korean leader Kim Jong Un, Trudeau criticized Trump for triggering a trade dispute and said Canada would retaliate with tariffs against the U.S. In tweets, Trump insulted Trudeau as "dishonest" and "weak".
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In a tweet posted Saturday evening, Trump said his decision to rescind support for the statement was based on "false statements" made by Trudeau during a press conference he gave, as well as "the fact that Canada is charging massive Tariffs" on US companies.
"This year's G7 meeting is already going down as the G6 + 1, with six members on one side and President Trump on the other", Al Jazeera's John Hendren, reporting from Quebec, said.
But unity was torn apart when the U.S. president took exception to Mr Trudeau calling USA policy "insulting".
"The reactions from White House Trade Czar Peter Navarro and NEC Director Larry Kudlow are so outsized it would seem that Trump himself was apoplectic when he heard/saw the comments from Prime Minister Justin Trudeau and that Navarro and Kudlow were speaking to an audience of one on instruction", he said.
Pompeo declined to comment on the specific remarks by Navarro. If it is fake, I have little hope for Canada while he is in charge.
"Fair Trade is now to be called Fool Trade if it is not Reciprocal", he tweeted. He adds that America "cannot let our friends, or enemies, take advantage of us on trade anymore".
Photo of Merkel and Trump captures G7 tensions
Russian Federation used to be included rounding out the group to G8, Trump has been lobbying for the country to be let back in. Also standing across the table are French President Emmanuel Macron and Prime Minister Theresa May .