While en route to a Singapore summit with North Korean leader Kim Jong Un after leaving the G7 meetings early, Trump attacked Trudeau's press conference with a series of tweets in which he called the Canadian Prime Minister "meek and mild" and "very dishonest and weak".
That was short-lived after Trump again took to Twitter following Prime Minister Trudeau reaffirmation of Canada's position on the tariffs.
What did Trudeau and Trump say?
Mr. Trump's actions led to an extraordinary juxtaposition: an abrupt public feud and deterioration of ties between the US and Canada at the same moment as warm words and a detente between the USA and North Korea. Mr Trump said the move would protect domestic producers that were vital to United States security.
In an appearance on CNN's "State of the Union," Kudlow argued that Trudeau's critique amounted to a betrayal of the G7, as well as the U.S.
After a pre-summit meeting of G-7 finance ministers, in which Washington was rebuked by the other six members on June 2, Treasury Secretary Steven Mnuchin said that despite sharp disagreements on trade, the other countries remain "our most important allies".
"We will not.sign a trade deal that expires every 5 years - that is not a trade deal", Trudeau said.
In a mocking tone, Kudlow rattled off the reasons Trudeau offered for his barbed critique of Trump's policies.More news: Samsung Galaxy A8 Star launched in the Philippines
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The U.S. had granted some allies including Canada temporary exemption from import tariffs on steel and aluminum.
The White House is quietly trying to fix the American government's fractured relationship with Canada as President Donald Trump is in Singapore to meet with North Korean leader Kim Jong-un, Politico reported Monday.
A Trudeau spokesman, Cameron Ahmad, said Saturday night that Trudeau "said nothing he hasn't said before - both in public and in private conversations" with Trump.
He added that Trump "is not going to let a Canadian prime minister push him around ... on the eve of this - he is not going to permit any show of weakness on a trip to negotiate with North Korea".
Trudeau said he and Trump have disagreed over Trump's call for Canada to open up its supply management system, which protects dairy, poultry and eggs farmers, during the hard ongoing renegotiation of the North American Free Trade Agreement. I'll tell you this to my friends in Canada that was one of the worst political miscalculations of a Canadian leader in modern Canadian history.
But Trump said that talks at the summit had been "extremely productive" about trade among other issues.
After the G-7 summit, Trudeau hosted a news conference where he said that the Canadian government "did not take" the US tariffs against Canada lightly.
Justin Trudeau's stance was solid and clear!
Trump contends that other countries "have been taking advantage of the United States on trade".