Trudeau said after the G-7 meeting that the aluminum and steel tariffs imposed by the USA on Canada on national security grounds were insulting and that "Canadians are polite, we're reasonable, but we also will not be pushed around".
Peter Navarro is President Donald Trump's National Trade Council adviser.
On Saturday, in response to US sanctions on Canadian steel and aluminum imports, Prime Minister Justin Trudeau said Canadians "will not be pushed around" and the imports were "kind of insulting".
Trump said Trudeau's promise not to back down from USA tariffs is "going to cost a lot of money for the people of Canada".
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Earlier today, Trudeau cheered Trump's bid to broker a deal to rid the Korean Peninsula of nuclear weapons, but he stayed mum on the USA administration's persistent trash talk.
Mr Trump was furious after Mr Trudeau had said at the end of a contentious economic summit in Quebec that he wouldn't let Canada be pushed around in trade relations with the United States.
He said there's still hope that stalled negotiations for a modernized North American Free Trade Agreement can be revived, provided Canada stays calm and measured in response to Trump's rants.
"He followed up by asking why the U.S. should "allow countries to continue to make "massive trade surpluses", asserting that it is "not fair to the people of America" and that the USA is suffering under a "$800 billion trade deficit".
At the administration level, the official said, Canadians concentrate on data in the face of some of the President's mischaracterizations of the trade relationship.
Also on Monday, former Trump aide and a former Breitbart editor Sebastian Gorka criticized Trudeau, calling him "childish".
Trudeau had little to say about Trump's threats when asked on his way Tuesday to a Cabinet session with his ministers on Parliament Hill. "This is about our economy and millions and millions of jobs". "But if history tells us one thing, it's that no one nation's preeminence is eternal", she said. He also said Canada "will not be pushed around". He added that Canada will "move forward with retaliatory measures" on July 1 against the U.S. That warning is apparently what set Navarro off. "We must put the American worker first!" he wrote in one his tweets.