"Let me correct a mistake I made", Navarro said at a Wall Street Journal conference Tuesday, according to video provided by the newspaper's CFO Network.
He made the apology - something that former US ambassador to Canada Bruce Heyman, among others, was demanding that he do - during a Wall Street Journal event today in Washington.
Upon learning of the insult by Nixon, Trudeau replied: "I've been called worse things by better people".
Navarro, for his part, suggested that he was following orders - but made a poor choice of words in doing so.
"I know it didn't look friendly", Trump said.
"We finished the meeting, really everybody was happy, and I agreed to sign something", Trump said.
Bruce Heyman, a former United States ambassador to Canada, said Mr Navarro had "crossed a line".
"On his comments, I'm going to stay focused on defending jobs for Canadians and supporting Canadian interests", Trudeau said before walking away from reporters.
The spat began at the end of the G7 meeting in Quebec Saturday, when Mr. Trudeau reaffirmed that Canada would retaliate against Mr. Trump's metals tariffs, which will charge Canada, Mexico and the European Union 25 per cent on steel and 10 per cent on aluminum exported to the U.S. Mr. Trudeau told reporters Ottawa "will not be pushed around" by Washington.
Same-sex couple accuse Uber driver of kicking them out for kissing
A lesbian couple in New York City said they were booted from an Uber over the weekend for sharing a "peck kiss" in the backseat. He said they played loud videos on their phones and that one of the women put her feet up on the seats. "It's my own vehicle ".
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.
"If you make a mistake, you should admit it, learn from it, don't repeat it", Navarro said.
"And he's giving a news conference about how he will not be pushed around by the United States". And I say, 'Push him around?
Amid the high-stakes trade negotiations still under way between China and the United States, Beijing is moving full steam ahead with a strategy that one top White House adviser said was the target of U.S. trade action. He's railed many times in recent days against Canadian import duties of 270 percent on dairy.
"It's very unfair to our farmers, and it's very unfair to the people of our country", he said. "And in fact the picture with Angela Merkel, who I get along with very well, where I'm sitting there like this. we're waiting for the document because I wanted to see the final document as changed. And it won't even be tough".
Navarro, a supporter of tariffs to help reduce the U.S.' trade deficit, turned his anger at Canada over the weekend as a Group of Seven meeting hosted by Trudeau ended in disarray and trade threats. Contributions of 200 words or more will be considered for publication.
The tariffs threaten an ever-shrinking sector in Canada that lost 53,000 jobs between 2001 and 2014.
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.
If the USA imposes a 25 per cent tariff on those exports, suddenly they don't make much economic sense, said Kristin Dziczek, vice president of industry, labour and economics at the Center for Automotive Research in Ann Arbor, Mich.
"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.