Trudeau's announcement, which came after the G-7 leaders signed a joint statement on trade, obviously frustrated the USA envoy, spurring Trump to revoke the US endorsement of the statement.
Trump, in a Twitter tirade on Thursday, pointed fingers at Canadian Prime Minister Justin Trudeau and French president Emmanuel Macron, stating that "they are charging the US massive tariffs and create non-monetary barriers". I mean, we have India, where some of the tariffs are 100 percent.
"I will always protect Canadian workers and Canadian interests", Trudeau said.
Trump's top economic adviser, Larry Kudlow, suggested Trump saw Trudeau as trying to weaken his hand before the summit with North Korea's Kim Jong Un, saying the president won't "let a Canadian prime minister push him around".
"He made an error", Kudlow said on CNN's "State of the Union".
"I have been Russia's worst nightmare", Trump claimed, "but with that being said, Russian Federation should be in this meeting".
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Trudeau "kind of stabbed us in the back", Kudlow said.
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A spokesman for Prime Minister Justin Trudeau said that Ottawa's position against such a move had not changed with regards to Russian Federation. "He did a great disservice to the whole G7", Kudlow said.
The G7 summit, which brought together world leaders from Germany, Japan, Canada, the US, Italy, France and the United Kingdom, was held in Canada over the weekend and it wasn't plain sailing for Trump and the other leaders.
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Trudeau, at a news conference at the conclusion of the G-7 summit, said that Canadians are polite, reasonable, but will not be pushed around.
The statement that Trump reneged on was also signed by the heads of government of Britain, Canada, France, Germany, Italy and Japan, all of which have also been hit by the United States tariffs of 25 percent on imported steel and 10 percent on aluminum.
Paris also delivered a withering response to the U.S. president's tweeted instruction for American officials to withhold their endorsement.
"He is not going to permit any show of weakness on the trip to negotiate with North Korea, nor should he", Kudlow said of Trump. On the other hand, another social media user said, "It looks as if Madam Merkel is teaching The Donald a lesson!" "So, I ask you, he gets up in the airplane and leaves".
Mr Trump responded by tweeting en route to his next summit, in Singapore, that he had instructed U.S. officials "not to endorse the communique as we look at tariffs on automobiles".