Navarro now regrets the "inappropriate" language he used, he admitted at a Wall Street Journal event on Tuesday. "That was my mistake, those were my words".
Trump refused to endorse the group's joint statement, said that Russian Federation should be readmitted, and traded barbs with Trudeau over an intensifying trade conflict.
The Trump administration recently slapped tariffs on steel and aluminum imports from Canada, Mexico and the European Union, prompting dollar-for-dollar retaliatory action from Prime Minister Justin Trudeau's government.
Trump says Trudeau "probably didn't know that Air Force One has about 20 televisions".
"Canadians, we're polite, we're reasonable, but we also will not be pushed around", Trudeau said Saturday as the gathering concluded after Trump had left early for the Singapore summit with Kim Jong Un. "It's kind of insulting". The president also repeated claims that Canada overtaxes American dairy products under its supply management system and complained about Canadian automobiles flooding the USA market.
Trump later accused Trudeau of making "false statements" and tweeted that the Canadian leader was "very dishonest & weak" during negotiations. He reiterated this sentiment on Tuesday in an interview with ABC News anchor George Stephanopoulos.
Trump's statements could be merely "chest thumping", he said, but after moving to impose tariffs on steel and aluminum on the basis of national security, the threat of new taxes must be taken seriously. "That was a mistake".
Also on Sunday, Trump's economic advisor Larry Kudlow told CNN that Trudeau "stabbed us in the back".
And it concludes with a direct shot at Trump, calling on the House to "reject disparaging and ad hominem statements by USA officials which do a disservice to bilateral relations and work against efforts to resolve this trade dispute".
"The president, coming late, stands before the cameras and says, "Why don't we add Russian Federation to the group". He also said the USA had a trade deficit of $17 billion with Canada, though he implied that it might be as large as $100 billion. For instance, Trump's steel and aluminum tariffs are expected to cause a drag on U.S. economic growth and result in a net loss of American jobs.
But the Harper government was uniquely positioned, said Christopher Sands, director of the Center for Canadian Studies at Johns Hopkins University, in that it had money to compensate farmers, few seats in Quebec and a massive trade deal to sell at the time.