President Trump reprised his criticism of Canada's prime minister here Tuesday, threatening that Justin Trudeau's tough exchanges with him over trade policy would "cost a lot of money for the people of Canada".
Trump was flying to Singapore for his summit with North Korean leader Kim Jong Un at the time.
Last Friday, Trump - feeling slighted by Trudeau, who took a tough stance toward USA tariffs by saying he wouldn't tolerate being "pushed around" - launched an attack via Twitter, calling the leader "dishonest" and "weak".
"When I got on to the plane, I think that Justin probably didn't know that Air Force One has about 20 televisions", Trump said.
Canadian Foreign Minister Chrystia Freeland says she is not ruling out potential retaliatory sanctions against the Trump Organization in response to the US president's recently announced tariffs.
"In conveying that message I used language that was inappropriate and basically lost the power of that message", Navarro said.
As he flew from Canada to Singapore on Saturday night, Mr Trump displayed his ire via Twitter, which he also employed to insult Mr Trudeau as "dishonest" and "weak". "Obviously we support the continuing efforts by the President on North Korea", the Canadian prime minister said.
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She said the answer to the dispute was simple: "The U.S. has to remove these unfair, illegal tariffs from Canada and from its allies". Very dishonest and weak.
Navarro, attending an event of "The Wall Street Journal" CFO Network in Washington, was asked if he was apologizing.
Before flying to Singapore, Mr. Trump was in Canada for the G-7 summit with leaders from Canada, France, Germany, Italy, Japan and the U.K. All seven leaders had worked out a joint statement stressing the importance of a rules-based worldwide trading system.
"I own that, that was my mistake, those were my words", Navarro said.
Trump has consistently railed against what he claims are unfair trade practices by some of America's biggest trade partners, including Canada. "Canadians, we're polite, we're reasonable, but we also will not be pushed around".
"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.
USA economic adviser Larry Kudlow said Trudeau "kind of stabbed us in the back" with his comments.