Trump, who has recently clashed with Canadian Prime Minister Justin Trudeau over his decision to impose tariffs on imports of Canadian steel and aluminum, accused Trudeau of gouging the USA with his own tariffs.
Although Trump says his tariffs are necessary to protect U.S. industry and workers, Canada and the European Union have denounced them as illegal.
In another tweet, Trump said he's "looking forward to seeing" Macron and Trudeau and accused them of "charging the USA massive tariffs and create non-monetary barriers".
US President Donald Trump - who regularly threatens to pull out of the North American Free Trade Agreement - insists that Canada and Mexico agree to a sunset clause that would allow a member nation to withdraw after five years.
The G7 summit participants managed to patch over their disagreements and agree to disagree on some issues in a joint final statement.
There'd been speculation Trump would cancel his appearance at the meeting amid widespread criticism from allies over steel and aluminum tariffs imposed by the U.S.in recent weeks.
Justify wins Triple Crown; Gronkowski the horse gets second
Majority he has already beaten, in either the Kentucky Derby or the Preakness , but there are a few new faces. If that victor is Justify , then US thoroughbred racing will have its 13 Triple Crown champion .
France warned Sunday that "fits of anger" could not dictate global cooperation after US President Donald Trump abruptly rejected a joint statement agreed following a bad-tempered G7 summit in Canada.
Trudeau and the other G7 leaders used their meeting to try to persuade Trump to abandon the tariffs, which affect all of America's G7 allies.
Though the US appears increasingly isolated from its allies, Trump on Saturday insisted that his relationships with other leaders remains "great".
"If they retaliate, they're making a mistake", Trump told reporters in a short but stern remark.
Later in the evening, during a pre-scheduled photo op, Trudeau was asked about Trump's late tweets about the communique and whether the development could have an impact on the future of the G7.
Screenshotting a headline about US President Donald Trump's suggestion that Russia be invited back to the group of nations, Conte tweeted: "I agree with President Trump: Russia should return to the G8". Some countries have retaliated with their own levies on USA imports. He says that we are the problem with tariffs. "And you know Obama can say all he wants, but he allowed Russian Federation to take Crimea", he said.