The U.S. president seems to be alluding to a discordance between Justin Trudeau overall temperament during the meeting and his stance on U.S. Tariffs between the neighbouring countries.
The EU has "a $151 billion surplus" which it should use to fund "military", said Trump Monday, referencing what Trump believes is the US' outsized financial contribution to North Atlantic Treaty Organisation.
"Trump declared that the trading policy of foreign countries with the United States is unfair, claiming that there is an "$800 Billion Trade Deficit", a figure that is as yet unsubstantiated by expert research.
"The historic and important agreement we all reached" at the summit "will help make our economies stronger and people more prosperous, protect our democracies, safeguard our environment, and protect women and girls' rights around the world. Our Tariffs are in response to his of 270% on dairy!" he said.
This is what he tweeted out Monday morning in Singapore (Sunday night in the United States): "Fair Trade is now to be called Fool Trade if it is not Reciprocal".
In response to the initial tweets critical of her country and prime minister, Canada's foreign minister, Chrystia Freeland, said her nation "does not conduct its diplomacy through ad hominem attacks". "But we say that with great sadness".
U.S. President Donald Trump throws the G7's efforts to show a united front into disarray after he became angry with Canadian Prime Minister Justin Trudeau, and instructed his representatives NOT to endorse the summit's joint communique.
Germany's Angela Merkel later described Mr Trump's decision to reject the joint communique initially agreed between the G7 leaders as "sobering" and "depressing". "Canadians, we're polite, we're reasonable, but we also will not be pushed around", he said.
"It started out as a good summit because we were actually talking to each other, instead of past each other", said Mr Peter Beyer, the German government's coordinator on trans-Atlantic relations.
Trump throws G7 into disarray with tweets after he leaves
Alluding to the tensions as he sat with Macron on Friday, Trump said: "We've had, really, a very good relationship, very special". On 1 June, the USA imposed a 25% tariff for steel and 10% for aluminium on imports from the EU, Canada, and Mexico.
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Seemingly still shaken, Whittaker was able to target a few big elbows that landed clean but couldn't halt the attack. Whittaker showed incredible resolve in survival, crawling again to his feet and trying to peel away the arms.
Trump infuriated his G7 allies recently by slapping them with the hefty tariffs on steel and aluminum - a move that prompted Canada and the European Union to threaten duties of their own.
Trudeau said he had reiterated to Trump, who left the G-7 meeting before it ended, that tariffs would harm industries and workers on both sides of the US-Canada border.
His comments also came just hours after Trudeau had tried to paint a more civil picture of the summit meeting, which was held in a quiet resort town north of Quebec City.
"We are convinced that a modernisation is perfectly possible, we are convinced that common sense will triumph", she said.
Trudeau had told reporters that Trump's decision to invoke national security to justify U.S. tariffs on steel and aluminum imports was "kind of insulting" to Canadian veterans who had stood by their USA allies in conflicts dating back to World War I.
He really kind of stabbed us in the back.
He warned that the US will take any action necessary to defend Americans from unfair trade practices.
A Democratic congressman chastised Canadian Prime Minister Justin Trudeau on Sunday for "sabotaging" trade negotiations as the fallout from this weekend's tense G7 summit continues, lending President Trump some bipartisan support as the war of words between the two countries escalates.
On Thursday, Trump took aim at Trudeau and Macron, accusing them of benefiting from one-sided trade arrangements with the United States.