'I used language that was inappropriate and basically lost the power of that message, ' says Navarro.
Reacting to Trump's attacks on Canadian Prime Minister Justin Trudeau over the weekend, Hayden said that Canada has regularly stood shoulder-to-shoulder with the United States as an economic and military ally - which is something that Trump now seems to be taking for granted.
Navarro later apologized for the comments, telling a news conference in Washington on Tuesday: "My job is to send a signal of strength". Trudeau had used similar language in the past, and Canada threatened retaliatory tariffs before the G-7 got underway in response to the US duties on metal.
Navarro's apology came days after Trump's spat with Trudeau over trade and the Group of Seven (G7) summit in Canada.
After Trump left the event, he launched a scathing attack on Canada's tariffs, while Trudeau called the US president's steel and aluminum imports tax "kind of insulting", and insisted that Canadians "will not be pushed around" when it comes to further talks.
"Canada does not believe that ad hominem attacks are a particularly appropriate or useful way to conduct our relations with other countries", Freeland said.
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"I think he set the news in a completely wrong direction as he headed off to Singapore", Heyman said.
"I will always protect Canadian workers and Canadian interests", Mr Trudeau said.
The NAFTA talks have stalled since Trump last month imposed 25 per cent tariffs on steel from Canada, Mexico and the European Union, and 10 per cent tariffs on aluminum.
The EU nations have agreed to stick to the communique as well, thus completely alienating the U.S. from its oldest allies, with Germany's economy minister claiming that the entire affair has brought the European Union closer. You know they put out a document, I don't know if you saw it.
It is unclear if Mr Trump's focus on getting tough with trade partners and solving the North Korean nuclear issue will have some influence on voters in the mid-term congressional elections in November. "Our Tariffs are in response to his of 270% on dairy!"
Both aides accused Trudeau of betraying Trump when he gave a news conference after the U.S. president had departed.
After leaving the meeting early, Trump tweeted that he was pulling U.S. support from a joint statement and he accused Trudeau of being weak and dishonest during a news conference.
And he confirmed that Canada would press ahead with dollar-for-dollar retaliatory tariffs on July 1 as previously announced. "We look forward to looking at the details of the agreement".