In a tense interview today with CNN's Jake Tapper on "State of the Union", Trump's economic advisor Larry Kudlow lambasted Trudeau.
Mr Trump left off last night with a series of tweets from Air Force One en route to Singapore for his nuclear summit Tuesday with North Korea's Kim Jong Un.
The Prime minister's spokesman tweeting that what Trudeau said wasn't anything he hadn't already said to Trump himself.
Trudeau finished with a warning to Trump, saying "Canadians are polite, we're reasonable, but we also will not be pushed around".
Trudeau told reporters that the statement was supported by every member, but Trump's Twitter message Saturday withdrew US support for the communique.
At the press conference Mr Trudeau insisted the US, Canada, Britain, France, Germany, Italy and Japan had figured out "consensus language" they could all agree to in the joint communique issued at the end of the G7 summit, despite the tensions with the US.
Trudeau said Trump's citing of "national security" as a reason for the levies being imposed was "kind of insulting" to Canadian veterans who had stood by their U.S. allies in conflicts dating back to World War I.
Trump withdraws endorsement of the G7 communique
In response, Canada , Mexico and the European Union said they were putting in place their own retaliatory measures. The EU then announced tariffs on U.S. goods ranging from Harley-Davidson motorcycles to bourbon.
President Trump did the courtesy to Trudeau to travel up to Quebec for that summit.
Some are calling it part of the "the Trump curse", how bad and embarrassing things seem to befall those critical of President Trump.
"There's a special place in hell for any foreign leader that engages in bad faith diplomacy with President Donald J. Trump".
But Mr. Trudeau also said it was "kind of insulting" the USA had imposed tariffs on steel and aluminum under the guise of national security, noting Canadians stood "shoulder to shoulder" with Americans in overseas wars.
Trudeau told reporters that imposing retaliatory measures "is not something I relish doing" but that he wouldn't hesitate to do so because, "I will always protect Canadian workers and Canadian interests".
Speaking at his closing news conference, Trudeau says the G7 has agreed to an "ambitious" communique - but he did not immediately release a document or provide details of where the exclusive club of wealthy democracies found common ground. "All Justin Trudeau had to do was take the win".
The Illinois Democrat acknowledged that Trudeau's tough talk with Trump may play well domestically, but said it would have longer-term negative implications.
In other developments at the two-day summit, Trudeau told Trump there would be no North American Free Trade Agreement unless the US dropped its tariffs on steel and aluminum.
"He is not going to permit any show of weakness on the trip to negotiate with North Korea, nor should he", Kudlow said.
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