"The problem was that in conveying that message, I used language that was inappropriate", he said.
Senator Bob Corker, the committee's chairman, said on Tuesday that he was "glad" Navarro admitted that he misspoke. He learned. You can't do that.
United States president Donald Trump retracted the previously agreed upon joint communique endorsing a rule-based trade system, at the very end of the G7 summit last week, accusing the group of seven nations of imposing "massive tariffs" on the US.
Although he insisted he had a good relationship with Mr Justin Trudeau, just days after leaving in disarray a G-7 summit the Canadian prime minister had hosted, Mr Trump took another dig at him, saying the U.S. had a big trade deficit with Canada and that "a little balance" was needed.
Navarro's apology could ease tensions after Canada's parliament condemned the personal attack on Trudeau and as Canadian Foreign Minister Chrystia Freeland prepares to meet with members of the Senate Foreign Relations Committee on Wednesday in Washington.
"I think that Justin probably didn't know that Air Force One has about 20 televisions", Mr. Trump said Tuesday.
"POTUS is not going to let a Canadian prime minister push him around ... on the eve of this", Kudlow said.
According to the currency conversion website operated by foreign exchange company XE, one USA dollar now buys just under 20.6 Mexican pesos. "Our Tariffs are in response to his of 270% on dairy!"
Hayden went on to slam Trump's treatment of Canada as humiliating for the United States. He learned. You can't do that.
Navarro was not the only White House adviser to hit the airwaves on Sunday with a tough message about Trudeau.
The White House's chief economic adviser, Larry Kudlow, similarly told CNN on Sunday that Trudeau "really kind of stabbed us in the back".
"When it comes to Trump tweets there's a discount premium to them", said Carleton University professor and foreign policy expert Fen Hampson who advises Trudeau to "hunker down, say nothing, not rise to the bait". However, Canada also imports services from the United States. "They don't take our farm products - many of them".
Rep. Peter Welch, D-Vt., called Trump's remarks over the weekend "astonishing" in an interview Monday.
The committee's Republican chair, Sen.
The two-day summit in Canada has been marred by fears of a trade war and tit-for-tat exchanges of hostile tweets, with U.S. trading partners furious over Mr Trump's decision to impose tariffs on steel and aluminium imports from the EU, Canada and Mexico as part of his "America First" agenda.