At that post-G7 press conference on Saturday, Trudeau had called US steel and aluminum tariffs "insulting" and said he would proceed with retaliatory tariffs that he'd already announced.
"I will always protect Canadian workers and Canadian interests", Mr Trudeau said.
"We have done just that at this summit, registering our deep disappointment at the unjustified decision by the United States to apply tariffs to European Union steel and aluminium imports".
"It's very unfair to our farmers, and it's very unfair to the people of our country", Trump said Tuesday in Singapore.More news: Italy, Malta must allow disembarkation of stranded migrants
More news: A reminder of celebrities' distance from us
More news: The Elder Scrolls 6 announced
"Canada does not conduct its diplomacy through ad hominem attacks ... and we refrain particularly from ad hominem attacks when it comes from a close ally", Ms Freeland told reporters in Quebec City on Sunday.
Trudeau's remarks prompted Trump to pull out of a joint communique that was a fragile consensus on the trade dispute between Washington and its top allies, Kudlow said.
Other G-7 countries lobbied unsuccessfully at the summit for the U.S.to reverse its tariffs on imported steel and aluminum imports.
He added that Trump "is not going to let a Canadian prime minister push him around ... on the eve of this - he is not going to permit any show of weakness on a trip to negotiate with North Korea".
Trump has drawn criticism in recent days for suggesting that Russian Federation rejoin the G-7. Sen.
White House economic adviser Larry Kudlow and trade adviser Peter Navarro drove the message home in an extraordinary assault on a close U.S. ally and neighbour. Canada argues that it still allows a higher ratio of sold milk to be imported from overseas than the USA does and that there is not necessarily a causal relationship between the US industry crisis and tariffs.
Bilous said there are still strong trade opportunities with the United States.
As well, she said the government should accelerate work on its Plan B in the event that Trump blows up NAFTA or follows through on threats to impose tariffs on autos and auto parts - a move Ambrose said would be devastating to Canada's economy. "I know it was reported sort of nasty both ways - I was angry at her, or she".