Trump - who left the G-7 summit and headed to Singapore for his planned summit with North Korean leader Kim Jong Un - lashed out at Trudeau after revoking US endorsement of the communique, dubbing the Canadian prime minister "meek and mild".
"PM Justin Trudeau of Canada acted so meek and mild during our G7 meetings only to give a news conference after I left saying that, "US Tariffs were kind of insulting" and he 'will not be pushed around.' Very dishonest and weak".
As he exited the world summit, Trump had delivered a stark warning to America's trading partners not to counter his decision to impose tariffs on steel and aluminum imports.
After departing from the Quebec summit for Singapore, Mr Trump tweeted that he had asked American representatives not to endorse the joint communique put out by the G7 leaders, which called for a "free, fair, and mutually beneficial trade" and the importance of fighting protectionism.
Canadian Prime Minister Justin Trudeau called United States metal tariffs "insulting" and announced retaliatory measures.
"Naturally we can not force the U.S. to change their mind", said Tusk, who is a former prime minister of Poland and is now president of the European Council.
Trudeau on Saturday said the U.S., Canada, Britain, France, Germany, Italy and Japan figured out "consensus language" they could all agree to.
A senior British Government source said: "We stand by the commitments made in the G7 communiqué".
Leading up to the meetings, Trump, Trudeau and French President Emmanuel Macron had suggested the potential for a tough tone, though they were cordial in face-to-face meetings.
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Canada rejects United States offer to end trilateral deal
President Donald Trump announced last week that steel and aluminium tariffs would apply to Canada, Mexico and the European Union. The United States trade representative office told the Washington Post that the USA actually has a trade surplus with Canada.
On 1 June, the USA imposed a 25% tariff for steel and 10% for aluminium on imports from the EU, Canada, and Mexico.
Trump, who last week slapped tariffs on steel and aluminum imports from Canada, the European Union and Mexico, left the Group of Seven summit early but not before threatening to cut off trade with countries that treated the United States unfairly.
The early exit also means he will be gone before allies begin closing news conferences likely to be laden with criticism of the U.S. stance on trade and Mr Trump's abrupt suggestion on Friday that Russian Federation be re-admitted to the elite grouping.
Alluding to the tensions as he sat with Macron on Friday, Trump said: "We've had, really, a very good relationship, very special".
Donald Trump accused the summit's chairman Justin Trudeau of dishonesty. "And no subsidies. I even said, 'no tariffs!'" Trump insisted.
Trump says they will either have a better agreement on NAFTA or two deals involving separate trade deals with both Canada and Mexico. "With one country we have $375 billion in trade deficits".
"The nature of the debate we had was rather appeasement and it stopped the escalation in terms of behavior", Macron, who had exchanged terse Twitter messages with Trump in the run-up to the summit, told reporters. The United States pays enormous tariffs on dairy.
French President Emmanuel Macron, for example, noted that under European Union rules France now has open borders with Britain and Germany and runs trade deficits with both - far from Trump's vision of "reciprocal" balanced trade.