Asked if he was apologising for the comments, Navarro said: "Yeah, absolutely".
"I think we are all sitting with bated breath hoping that cooler heads prevail, but most of us believe there's an equal chance that they won't", said Dennis DesRosiers, president of DesRosiers Automotive Consultants Inc.in Richmond Hill, Ontario.
"He'll learn that's going to cost a lot of money for the people of Canada".
Lindsey Graham on Tuesday suggested that if North Korean leader Kim Jong Un attempts to renege on a deal with Donald Trump, he could end up on the United States president's bad side - just like the leader of one of the US's closest allies, Canadian Prime Minister Justin Trudeau.
"In conveying that message, I used language that was inappropriate and basically lost the power of that message", CNN quoted Navarro as saying on Tuesday at the Wall Street Journal's annual CFO Network conference.
"Justin probably didn't know that Air Force One has about 20 televisions, and I see the television", Trump said.
The move has been roundly criticised by Canada and the European Union, leading to heightened tensions at last week's summit of the Group of Seven wealthy democracies - just before Mr Trump left for Singapore and a meeting with North Korean leader Kim Jong-un.
The insults stemmed from a closing G7 press conference on Saturday in which Trudeau called U.S. steel and aluminum tariffs "insulting" and pledged to proceed with previously announced retaliatory tariffs.
"Canadians are polite and reasonable but we will also not be pushed around", he said.
An angry Trump refused to sign a joint statement issued at the end of the summit, and he and his top aides assailed Trudeau, accusing him of dishonesty and betrayal.
North Korea: Trump has agreed to step-by-step denuclearization
But according to Green, Trump had not notified South Korea or Japan before announcing the decision, catching them by surprise. Their first moments together were picked apart for any clues about how the political heavyweights would match up.
However, the office of the U.S. Trade Representative has said the United States ran an $8.4 billion trade surplus with Canada in 2017. I really did, other than he had a news conference, that he had because he assumed I was in an airplane and I wasn't watching.
On Tuesday, Trump said: "We have a big trade deficit with Canada.it's close to $100 billion a year deal loss".
Graham pointed to Trump's trade fight with Canadian Prime Minister Justin Trudeau as an example of what happens when a foreign leader tries to "play" Trump.
"He learned", Trump said.
In the same set of tweets, Trump said: "Justin acts hurt when called out!" "(Trudeau) learned. You can't do that.
"It's very unfair to our farmers, and it's very unfair to the people of our country", he said.
Canadian officials have stressed the two countries' extensive trading relationship and pointed out that Canada is the top export destination for 35 USA states and that 9 million jobs in the United States depend on trade with its northern neighbor. They take effect July 1.
NDP Leader Jagmeet Singh also urged the federal government to get serious about drafting a rescue plan for steel and aluminum workers, who are going to feel the brunt of the initial impact of the dispute - and soon.
"We've got to look at what supports are available to ensure that if their jobs, their livelihoods are compromised, what can the government do to support these folks".
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