A subsequent visit in April this year warranted only a working lunch for the German leader, several days after fellow European Union leader Mr Macron got the full, formal state dinner treatment from Mr Trump.
On 1 June, the U.S. imposed a 25% tariff for steel and 10% for aluminium on imports from the European Union (EU), Canada, and Mexico.
Trump tweeted Saturday night.
Mr. Trudeau's office responded to Mr. Trump's tweets accusing the Canadian leader of "false statements" on Saturday, saying that the Prime Minister said nothing during the G7 summit that he had not said previously.
Canada responded to the United States move with counter-measures. But the president broadsided his allies after leaving the meeting by disavowing a joint statement the US had agreed to, criticizing Trudeau and vowing tariffs on automobiles. "We make commitments and keep to them", a statement from the French presidency quoted by AFP news agency said. Kudlow suggested on "Face the Nation" that Mr. Trump saw Trudeau as trying to weaken his hand before that meeting, saying the president won't "allow the people to suddenly take pot shots at him".
Donald Trump and Justin Trudeau have been at loggerheads over trade tariffs
Sharply criticizing Trump's remarks on tariffs, Prime Minister Trudeau promised that Canada would answer with its own on July 1 unless the USA reversed course.
"Canadians, we're polite, we're reasonable, but we also will not be pushed around", Mr. Trudeau said.
Most proper politicians are too reserved to, y'know, slag off the other members of the summit to their faces, but the Donald has no such qualms. The document, however, also included a pro-free-trade message at odds with Trump's new tariffs, declaring: "We acknowledge that free, fair and mutually beneficial trade and investment, while creating reciprocal benefits, are key engines for growth and job creation".
"His message from Quebec to Singapore is that he is going to meld the industrial democracies to his will - and bring back Russian Federation, " said Steve Bannon, Trump's former campaign and White House adviser.
They also stepped up Trump's assault on Trudeau himself - unprecedented in the neighbouring countries' longstanding relationship.
"And as far as this retaliation goes, the American press needs to do a much better job of what the Canadians are getting ready to do because it's nothing short of an attack on our political system and it's nothing short of Canada trying to raise its high protectionist barriers even higher on things like maple syrup and other goods", Navarro said.
The latest condemnation of Trudeau followed Trump's decision to not sign a G-7 communique after a weekend meeting of the seven largest industrialized economies, a group of traditional USA allies.
Canada's foreign minister, Chrystia Freeland, said her country "does not conduct its diplomacy through ad hominem attacks".