Trump was furious after Trudeau had said at the end of a contentious economic summit in Quebec that he wouldn't let Canada be pushed around in trade relations with the United States.
"That co-operation to reduce costs, find efficiencies and open up trading within our own region will benefit not just small and medium enterprises, but the region overall", Bell said.
That was when Trudeau said Canada would take retaliatory steps in response to steel and aluminum tariffs imposed by Trump on Canada and other allies.
Navarro condemned Trudeau following the Canadian leader's news conference after his summit meeting with Trump and other world leaders from the Group of Seven.
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 United States had a big trade deficit with Canada and that "a little balance" was needed. "That's what bad faith Justin Trudeau did with that stunt press conference".
The backstabbing charge seems over the top, but the White House's contention is that Trudeau ought to have capped the G-7 summit by talking about Trump and the U.S.
Trump's ire was not doused by time and Tuesday he spoke at a press conference in Singapore after meeting with North Korea's Kim Jong Un, saying Canada would pay for Trudeau's perceived treachery. German Chancellor Angela Merkel, who also attended the summit, told German public television that she found Trump's tweet disavowing the G-7 statement "sobering" and "a little depressing".
On 1 June, the USA imposed a 25% tariff for steel and 10% for aluminium on imports from the European Union (EU), Canada, and Mexico.
Navarro took a decidedly more conciliatory tone Tuesday, but still asserted that Trudeau had committed a "breach of protocol" that the Trump administration considered "inappropriate". According to the Office of the United States Trade Representative, the US had an $8.4 billion trade surplus with Canada, but a $17.5 billion trade deficit if services were excluded.
"When I got out to the plane, I think that Justin probably didn't know that Air Force One has about 20 televisions".
Heyman waged a campaign on Twitter to persuade Navarro to apologize by saying he was contacting USA politicians about his remarks.