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".
Former Minister of National Defence in Stephen Harper's government, among other positions, Peter MacKay dropped by our Toronto Sun offices to chat with Editor-In-Chief Adrienne Batra and unpack what Trump and Trudeau's growing feud means to Canada (hello: recession?!) and why he wishes our PM had been chiller with Trump.
It also covered other issues including relations with Russian Federation.
Timeline of trade tensions since the US decision to impose tariffs on steel and aluminium imports
The leaders of the G7, the world's most powerful industrialized countries including Canada, France, Germany, Italy, Britain, Japan and the USA, meet every year to discuss collaboration on issues like world economy, climate change, security and peace.
"We should all be nervous about it", Pallister said.
The U.S. president is lashing out on several fronts.
Trump has repeatedly threatened to pull out of NAFTA if the agreement is not renegotiated in way that he views as more favorable for USA companies and workers.
About trade matters, which Trump admitted has become the main topic of discussion at the G7 Summit at La Malbaie, the US President said his country is being treated unfairly by everyone and that he's "going to deal with the unfair trade practices" of other G7 members.
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"We are polite and reasonable", Trudeau said, "but we also will not be pushed around".
In a mocking tone, Kudlow rattled off the reasons Trudeau offered for his barbed critique of Trump's policies. Minimum is 17B. Tax Dairy from us at 270%.
From Singapore, where he is set to hold a historic summit with North Korean leader Kim Jong Un, he unleashed a volley of angry tweets targeting the European Union, Canadian Prime Minister Justin Trudeau and NATO allies, including Germany.
Earlier in the day, Trump had said there should be "tariff free" trade between the G-7 nations, though he did not elaborate on how or whether the United States would reduce barriers.
President Donald Trump took more swipes at Canada and its prime minister over trade issues as he settled in for a summit with North Korea in Singapore, contending that "Fair Trade is now to be called Fool Trade if it is not Reciprocal".
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June 10 - Trump's economic advisor Larry Kudlow tells CNN that Trudeau "stabbed us in the back". French President Emmanuel Macron said France and Europe were standing by the G-7 statement, adding "whoever reneges on them is showing incoherence and inconsistency".
"[Trudeau] really kind of stabbed us in the back", Kudlow said. He complained he was blindsided by Trudeau's criticism of his tariff threats during the premier's summit-ending news conference.
"The US pays close to the entire cost of Nato-protecting many of these same countries that rip us off on trade (they pay only a fraction of the cost-and laugh)", he tweeted. That's what weak, dishonest Justin Trudeau did.
While other presidents and prime ministers have had testy relations - president Richard Nixon famously used a profane word, behind closed doors, to refer to Trudeau's father Pierre Trudeau, also in the context of trade talks - neither side has demonstrated this level of animosity since John Diefenbaker feuded with John F. Kennedy in the early 1960s.
"Fair trade now fool trade", Trump vents anger on North Atlantic Treaty Organisation allies, Trudeau
Canada's Justin Trudeau and other leaders had given closing press conferences and announced a US-backed joint statement . Trump's renewed comments on trade come amid a growing dispute between Washington and its top allies.