In a tweet posted Saturday evening, Trump said his decision was based on "false statements" made by Trudeau during a press conference he gave, as well as "the fact that Canada is charging massive Tariffs" on US companies.
"The reactions from White House Trade Czar Peter Navarro and NEC Director Larry Kudlow are so outsized it would seem that Trump himself was apoplectic when he heard/saw the comments from Prime Minister Justin Trudeau and that Navarro and Kudlow were speaking to an audience of one on instruction", he said.
Mr Kudlow accused the Canadian PM of betraying Mr Trump with "polarising" statements on trade policy that risked making the United States leader look weak ahead of a historic summit with North Korean leader Kim Jong-un.
"State of the Union" host Jake Tapper asked Kudlow what right Trump and other US officials had to be offended by Trudeau's comments, given the dispute.
President Donald Trump's fight with Canadian Prime Minister Justin Trudeau not only threatens to unravel the US's relationship with one of its oldest worldwide partners - it could also significantly damage the United States economy. Conspiracy theories, jokes and memes started bubbling up after the Canadian Prime Minister's eyebrows appeared uneven during his press conference with French president Emanuel Macron. And yet when you listen to Navarro it sounds like Canada has broken diplomatic relations with the US and declared war on the place. We negotiate in good faith but we won't be pushed around. Yet at the weekend's G-7 meeting, President Donald Trump surprised many of his critics by demanding an end to all tariffs and subsidies in the G-7 trade zone.
"Justin Trudeau's left eyebrow detached after meeting Trump - so what?"
He also accused Trump of chipping away at his relationship with his Western allies by unilaterally pulling out of the Iran nuclear deal.
Mr Navarro told Fox News: "There is a special place in hell for any leader that engages in bad faith diplomacy with President Donald J Trump and then tries to stab him in the back on the way out the door and that's what bad-faith Justin Trudeau did with that stunt press conference, that's what weak, dishonest Justin Trudeau did".
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Merkel: G-7 summit with Trump was a 'sobering' experience
Before arriving at the Quebec summit, Trump injected fresh drama by asking why Russian Federation wasn't included in the group. The White House is escalating its verbal attacks against Justin Trudeau , the prime minister of close American ally Canada.
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Justin Trudeau and President Trump participate in the working session at the G7 summit on Friday. Big trade barriers against US farmers, and other businesses, will finally be broken. "He was even willing to sign that socialist communique". Trudeau responds with a laugh: "So I'd say NAFTA is in good shape".
"Are you disappointed the President is leaving early?" a reporter asked Trudeau. "That will not stand", he noted.
Trump's decision to withdraw his support for the communique has drawn sharp criticism from European countries.
Trump said in a second tweet. "We have seen this with the climate agreement or the Iran deal".
The fight could have serious economic consequences, since Canada is the US's top trade partner and the largest export market for 32 states.
Canada responded by slapping tariffs on $12.8billion worth of United States exports, including metals, toilet paper, ball point pens and pizza.
But if Trump is ultimately supportive of free trade, why inflict tariffs on US allies under unserious national security pretenses? "But we say that with great sadness".
"It would be with regret but it would be with absolute certainty and firmness that we move forward with retaliatory measures on July 1 applying equivalent tariffs to the ones that the Americans have unjustly applies to us", Trudeau said at a press conference closing the summit.