"Not just the United Kingdom, but Canada, Germany, Japan - these aren't foes, these are friends", he told The Associated Press at a technology conference.
Prime Minister Justin Trudeau's government is in talks to save the deal and, in concert with the other major trading powers in the G7 group of nations that met in Quebec over the weekend, pushed back against Trump.
Trudeau says five of the G7 countries agreed to a plastics charter to further protect the environment and oceans.
In his news conference, Trudeau had spoken of retaliatory measures that Canada would take next month in response to Trump's decision to slap tariffs on steel and aluminum imports. "I don't understand the obsession with trade relations with Canada", he said on Fox News, given that Canada is the biggest single buyer of American goods and services in the world.
At a meeting in Berlin hosted by Chancellor Angela Merkel, the German leader and top officials from a half-dozen worldwide organizations said in a joint statement that the "increasing protectionist tendencies provide us with a clear incentive and opportunity to express our strong support for the multilateral trading system".
But Trudeau pointed to firm commitments from some members of the G7 to promote cleaner oceans and fund better access to education for girls in poor countries.
A Trudeau spokesman, Cameron Ahmad, said Saturday night that Trudeau "said nothing he hasn't said before - both in public and in private conversations" with Mr. Trump.
Trump's actions are being called ludicrous and absurd - but then again, coming from a man whose only experience before entering politics was as a businessman (with highly questionable dealings and tactics) and a reality TV show host, might not be all that surprising.
Prince George and Princess Charlotte Play at Polo Event
Her mum, the Duchess of Cambridge , who often likes to coordinate Charlotte's outfits with hers, was also wearing a summery frock. Charlotte donned sunglasses and ran in bare feet, at one point attempting a head stand in front of her laughing mom.
Trudeau used a media conference on Saturday to reject a USA demand for a sunset clause in the North American trade agreement, Nafta, that Trump has at different times pressed to abolish or renegotiate. Big trade barriers against US farmers, and other businesses, will finally be broken.
Trump fired off a volley of tweets on Monday further venting anger at North Atlantic Treaty Organisation allies, the European Union and Trudeau.
Trump had earlier called Trudeau's statement as "dishonest and weak".
The director of the national economic council under the Trump administration, Larry Kudlow, said during a CNN interview that Justin Trudeau stabbed the U.S.in the with his comments during a press conference held after U.S. President Donald Trump left the summit. Trudeau stuck our president in the back.
It came in response to what he claimed were "false statements" by Canadian premier Justin Trudeau.
London Mayor Sadiq Khan said he hoped Trump would reconsider policies such as the recent increase in tariffs on steel and aluminum from Europe, China, Mexico, Canada and elsewhere.
Trump's stinging critique - while technically accurate - obscures the larger trade relationship between the two countries.
Bashing the leader of one of America's venerable allies, the White House escalated its trade tirade and leveled more withering and unprecedented criticism Sunday against Canada's prime minister, branding Justin Trudeau a back-stabber unworthy of President Trump's time.
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