Trudeau told reporters the U.S. national security justification for the tariffs on steel and aluminum was "laughable". That set the tone.
Trump, of course, responded in kind. But it must be both.
Canada hosts this year's G7 in La Malbaie, Quebec.
In what's been seen a jab at Mr Trump, he added: "Nobody is forever".
"Don't blame Mr Trump, blame the nations that have broken away".
Likewise, Macron described the moment as a period of "great challenges", but also defended his efforts to befriend the American president, saying the U.S.is a historical ally and "we need them".
Trump pulled Macron aside for a quick chat on their way into the summit and Macron posted the pleasantries on Twitter. G7 officials had planned for their leaders to discuss ways to counter Russia's interference in their democracies.
Russian Federation was expelled from what had been the G-8 in 2014 following its annexation of Crimea.
Meantime, Italy's new premier is backing Trump's call, tweeting his support on Friday.
Instead of a G6-plus-one summit, it was now a G5-plus-one-plus-one meeting.
Woman missing after alligator 'dragged' her into Florida pond
Animal catchers from the Florida Fish and Wildlife Conservation Commission have also gone to the scene to look for the alligator. A woman has been dragged into a Florida lake by an alligator while out walking her dogs.
"It's highly unlikely there will be a final communique", a G7 official said on condition of anonymity.
President Trump flew to Canada Friday for the G-7 meeting - the first of two high-profile summits on his agenda.
Good question-and there's a solid chance that it won't be signed by the U.S.at all.
One source described Friday's meeting as a "frank" airing of grievances in a "non-emotional setting", adding that Trump appeared surprised that Canada had responded so vehemently to the US tariffs. The United States sells more dairy products to Canada than it buys in return. "There's a lot of global resistance, I think, to the way the Trump administration is trying to push USA trade policy".
Tweeting in English, Macron stressed: "No leader is eternal".
"Canada will not change its mind when it comes to the illegal and absolutely unjustified application of tariffs on steel and aluminum", Canadian Foreign Minister Chrystia Freeland said on Friday. In the wake of the reports about Russian interference in the 2016 presidential election and the ongoing investigation into whether the Kremlin colluded with the Trump campaign, the president faced some severe pushback for his suggestion to welcome Russia back. Then he threw in another smoke bomb, suggesting he might split NAFTA up into separate deals with Canada and Mexico.
White House Press Secretary Sarah Huckabee Sanders announced that Trump would be represented by Everett Eissenstat for the last sessions. Mr. Trump is a constant surprise.
Time says that the Office of the United States trade representative concludes that in 2016 the USA exported $320.1 bn. of goods and services to Canada but only imported $307.6 bn from Canada. "The rules-based worldwide order is being challenged", Mr. Tusk said.
You can bet Mr. Tusk's list of the usual suspects out to disrupt the world order includes Russia's Mr. Putin. He has also refused to condemn the Russian strongman over the Kremlin's interference in the US presidential election, at one point suggesting he trusts Putin's denials of wrongdoing over the findings of his own intelligence agencies.