"I know it didn't look friendly", Trump said.
At an event hosted by the Wall Street Journal, Mr Navarro said he had made a mistake.
As we've argued elsewhere, Trump appears to be targeting allies as a means of rupturing their mindset-convincing them that they are no longer deserving of American coddling just because of their geopolitical status.
"If you make a mistake, you should it admit it, learn from it, don't repeat it", Navarro said. "You can't do that".
"On (Trump's) comments, I'm going to stay focused on defending jobs for Canadians and supporting Canadian interests", he said.
Trump, who had criticised Trudeau after the G7 meeting in Canada on the weekend, said the United States had a big trade deficit with Canada, and "a little balance" was needed.
Other leaders of the G-7, including the United Kingdom, France and Germany - which were also hit by Trump's steel tariffs - came to Trudeau's defense.
"I'm pretty sure that circles of hell are not reserved for Canadians proposing retaliatory tariffs", said Texas Republican Sen.
Canada controls dairy supplies, prices and imports, and the system has recently become the main target of Trump's verbal attacks amid talks toward a new trade agreement.
Trump followed through on his tweet by pulling USA support for a G-7 communique.
The president's staff then blasted Trudeau on Sunday with economic advisor Larry Kudlow accusing Canada of stabbing the U.S.in the back.
"The meeting on Monday in Singapore with respect to North Korea - that holds important potential for the peace and security of the world", Goodale told FOX Business' Stuart Varney Wednesday on "Varney & Co".
On Wednesday, it was officially confirmed that the United Bid, which includes Canada, Mexico, and the USA, would be hosting the FIFA World Cup 2026. "Politicians can get into disagreements and they can have heated disputes but you have to think about where does this go, how bad could it get and the disputes are over a really, really small share of GDP". Perhaps they were trying to show the power they have. It's either 17 but could actually be 100 billion. Americans are thankful for Canadian artists like Leonard Cohen, Celine Dion and Drake as well as more significant historical acts like when the people of Gander, Newfoundland took in those whose planes were grounded in the town following the 9/11 attacks.
Navarro's remarks strained the already tense negotiations between the United States and Canada.