He called on Trudeau to apologise to Trump.
Warner said in an interview on the Politico Money podcast released Wednesday that Trump's defiant performance at the G-7 gathering in Canada highlighted a wedge that the president has driven between the USA and some of its closest allies.
At that post-G7 press conference on Saturday, Trudeau had called USA steel and aluminum tariffs "insulting" and said he would proceed with retaliatory tariffs that he'd already announced.
While it is easy to dismiss such language as characteristic Trump hyperbole, weaponized to soften up negotiating partners, it is notable that the president's recently imposed tariffs on steel, aluminum, washing machines, and solar panels actually reflect, remarkably, "worse than China" thinking.
"That Canada could be considered a national security threat to the United States is inconceivable", said Prime Minister Justin Trudeau.
But after viewing the press conference on television Saturday, it set Trump off on a tweet storm, accusing Trudeau of dishonesty and calling him "weak".
"As the former USA ambassador to Canada I am calling on Peter Navarro to formally and publicly apologize to @JustinTrudeau and more importantly the Canadian people for his insulting and inappropriate remarks", tweeted Bruce Heyman, who was ambassador under former president Barack Obama. "The problem is that in conveying that message I used language that was inappropriate".
Trudeau has declined to directly respond to Trump's criticism of him.
Donald Trump's top two aides are keeping up the president's attack on the prime minister over what they see as his betrayal of Trump right before his summit with North Korea. "And Justin. And I said, "Oh that's nice, Justin's giving a" - And then he talked about how they won't be bullied". We just shook hands.
No, if Mr. Trump really was as offended as he makes out, it wasn't caused by a Canadian failure to realize that American eyes are watching.
Dias is suggesting the federal government start looking at measures that stymie the flow of electricity, oil and other natural resources that go to the US.
Kudlow said on CNN that Trump's reaction to Trudeau's comments has been "in large part" because he does not want "any show of weakness" ahead of that meeting.
"Sometimes when we think about tariffs, when we think about a trade war, we lose sight of the real impact, and that's on workers", Singh told a news conference on Parliament Hill.