"This was very disconcerting", he said, adding: "I do not like to see that type of language being used without having a real strong basis for it".
Trump's comments after a historic summit in Singapore with North Korean leader Kim Jong Un were the president's most extensive on the matter since he tweeted that Trudeau was "very dishonest and weak" and raised the prospect of tariffs against auto imports, a move that would imperil the Canadian economy.
“I used language that was inappropriate,” trade adviser Peter Navarro said according to Wall Street Journal reporters. | Getty
Republican Senator Susan Collins of ME said that while her state has experienced "frictions" with Canada over lobsters and other goods, the USA should not be alienating one of its biggest trading partners.
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Mrs May said she made clear to Mr Trump that the United States levies were unacceptable - but she underlined the need for dialogue to stop the dispute from escalating.
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The president cites national security for imposing a 25 percent tariff on Canadian steel, and 10 percent on aluminum. The Americans' criticism of Trudeau left a former Canadian prime minister, Stephen Harper, stumped.
One photo in particular shows Trudeau trying to engage with a sullen Trump.
The Canadian lawmakers' solidarity came a day after White House trade adviser Peter Navarro said: "There is a special place in hell" for Trudeau for his "bad faith diplomacy" with Trump, as a dispute over trade escalated.
White House trade and manufacturing adviser Peter Navarro (L), a member of the US trade delegation to China, leaves a hotel in Beijing, China May 3, 2018.
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Critics like Hall Findlay say it is a barrier to successful free-trade deals such as NAFTA, and increases the cost of dairy, eggs and chicken for consumers, which has an unfairly disproportionate impact on low-income families. No, I have a good relationship with Justin Trudeau.
Navarro continued, "That's what weak, dishonest Justin Trudeau did, and that comes right from Air Force One". We just shook hands. "I mean seriously, Russia, who took over Crimea, all the violence that's taken place in Ukraine, the poisoning of people in the United Kingdom, the influence in our election this last time period", Heyman recounted. "Canada. Maybe we need a northern wall", he said.
Dairy has emerged as the latest flashpoint between the US and Canada as they renegotiate the 1994 North American Free Trade Agreement.
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"There are more jobs now posted than there are people looking for work in the United States, and we've cut immigration pretty substantially", he said, noting that the country's birth rate is low.