In an even more remarkable appearance on "Fox News Sunday", trade adviser Peter Navarro said, "There's a special place in hell for any foreign leader that engages in bad-faith diplomacy with President Donald J. Trump and then tries to stab him in the back on the way out the door".
The early exit also means he will be gone before allies begin closing news conferences likely to be laden with criticism of the USA stance on trade and Mr Trump's abrupt suggestion on Friday that Russian Federation be re-admitted to the elite grouping.
The comments, made after Trump had left to go to Singapore for his much-anticipated meeting with North Korean leader Kim Jong Un, infuriated the USA president. Trump is due to meet with North Korea's Kim on Tuesday.
It was an unprecedented attack on the leader of the USA neighbor and ally.
Trudeau said he found the United States move to impose tariffs "insulting" and that he would continue to stand up for Canada's interests, eliciting Trump's tweet backing out of the consensus agreement while flying to Singapore for a summit with North Korea's leader Kim Jon UN.
The Prime Minister said: "Where we disagree with our allies on something it is right that we say so and air the issue openly and frankly".
However, former US ambassador to Canada Jim Blanchard said the auto sector in the USA 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.
A spokesman for Trudeau did not address Trump's insults in a statement. "The Prime Minister said nothing he hasn't said before - both in public, and in private conversations with the President", the office added.
P&G Celebrates World Oceans Day
Canada has been soliciting comments and ideas from Canadians about how to reduce plastic pollution and improve recycling . Peach-Brown talks about the odd fact that we are living on a planet called Earth, rather than a planet called Ocean.
Kim Jong-un "must not see American weakness", Kudlow said, shaking his jowls in a very Nixonian fashion.
French President Emmanuel Macron said on Thursday that G-7 wouldn't mind signing a six country agreement, suggesting that the Group of Seven doesn't need the U.S.
France is also standing by the G7 communique, a French presidency official said, adding anyone departing from the commitments made at the summit would be showing their "incoherence and inconsistency".
That decision was "kind of insulting" to Canadian veterans who had stood by their U.S. allies in conflicts dating back to the first world war, Trudeau said. By its second day, the summit had dissolved into chaos, with Trump leaving early and then retracting his endorsement of the final statement from the G7.
"The president will continue to say what he says", he said of Trump. "Will there be differences of opinion, will we not like a statement that one or the other makes?"
In recent weeks, trading partners of the United States have criticised new tariffs on steel and aluminium imports imposed by the Trump administration. The non-factual part of this is - they have enormous tariffs. "You know, it's like the gig is up".
The G7 countries, in the communique, "acknowledge free, fair, and mutually beneficial trade is a key engine for growth and jobs", and commits these nations to modernize the World Trade Organization (WTO).