Trump's personal attack on Trudeau is unprecedented in the countries' longstanding relationship.
Ontario premier-designate Doug Ford is also among those setting aside his political differences with Trudeau, re-asserting today that he stands "shoulder to shoulder" with the prime minister on trade.
Trump's about-turn also earned him a rebuke from long-time critic, Republican Senator John McCain, who tweeted to U.S. allies, "Americans stand with you, even if our president doesn't".
"We are focused on everything we accomplished here at the G7 summit", the statement, released by Cameron Ahmad, said. Can't do it in person.
"I have made it very clear to the President that it is not something we relish doing, but it something that we absolutely will do", Trudeau said.
California Democratic Sen. Dianne Feinstein, in a separate interview on the same CNN program, called Trump's decision not to sign the communique a "big mistake" that distanced the United States from its top allies. He had other things, bigger things, on his plate in Singapore.
Trump called the summit a "one time shot" for Kim, but expressed optimism at the beginning of talks with the North Korean regime. And what did Trudeau do as soon as the plane took off from Canadian airspace? "That's what weak, dishonest Justin Trudeau did, and that comes right from Air Force One". "And we're not going to be able to do that work when our retaliatory tariffs, which are real, they're significant", Morneau said in a Saturday interview.
Trump's fellow G7 leaders watched him as he slowly made his way to his seat, which was across from Trudeau and next to International Monetary Fund managing director Christine Lagarde. "Fake news CNN", Trump said.
But the criticism left a former Canadian prime minister, Stephen Harper, stumped. He says the meeting was not contentious and that he gets along well with the other leaders. "Since then we have seen an increase in Russian misbehavior and attempts to undermine democracy in Europe". And he said, "I just want to inform you that we have reduced it to 75, but we have further reduced it to 50".
"The European Union is brutal to the United States, and they know it", Trump said, adding that other leaders acknowledge as much in private.
A few hours earlier, Trudeau had told reporters that all seven leaders had come together to sign the joint declaration. I mean, we have India, where some of the tariffs are 100 percent. "Our Tariffs are in response to his of 270 per cent dairy!"
Exiting a world summit with characteristic bravado, President Donald Trump delivered a stark warning Saturday to America's trading partners not to counter his decision to impose tariffs on steel and aluminum imports.
Trump's move creates challenges for the G-7's other leaders, who are reluctant to eliminate levies they charge on some imported products.
European officials said Trump had tried to water down the language in the draft final summit communique on the WTO and rules-based trade.
During the summit, Trump reportedly showed up late to a breakfast discussion about gender equality and skipped sessions on climate change, clean energy and protecting the oceans.
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