Mr Trudeau, who had said at the news conference that Canada would retaliate over new USA tariffs, did not respond to questions about Mr Trump when the prime minister arrived at a Quebec City hotel on Sunday for meetings with other world leaders.
Foreign Affairs Minister Chrystia Freeland was measured Sunday, saying only that "Canada does not believe that ad hominem attacks are a particularly appropriate or useful way to conduct our relations with other countries".
The US leader, who plans to leave the meeting of major industrialised nations early, also lashed out at long-standing allies over their criticism of his trade policies. -Canada border. Trudeau told reporters that imposing retaliatory measures "is not something I relish doing" but that he wouldn't hesitate to do so because "I will always protect Canadian workers and Canadian interests".
"We will not.sign a trade deal that expires every 5 years - that is not a trade deal", Trudeau said. "He really kinda stabbed us in the back", top USA economic advisor Larry Kudlow said of Trudeau on CNN.
The group consists of the United States, Canada, France, Germany, Italy, Japan and Britain.
White House economic adviser Larry Kudlow and trade adviser Peter Navarro drove the message home in an extraordinary assault on a close United States ally and neighbour. "He did a great disservice to the whole (G-7)", White House Economic Advisor Larry Kudlow told CNN.
U.S. President Donald Trump's Twitter tirade against Prime Minister Justin Trudeau following the G7 is sparking promises of support from some of Trudeau's political rivals as well as calls for calm from foreign diplomats and experts.More news: Liverpool goalkeeper target 'very happy' to stay put, claims World Cup victor
Peter Navarro, the director of the White House National Trade Council, took the attacks a step further.
"Justin Trudeau's left eyebrow detached after meeting Trump - so what?" Navarro later clarified that his comments were "the sentiment that was on Air Force One after that".
Let's get real here in past 24 hours President of the United States has been slammed by Justin Trudeau, Robert De Niro, Emmanuel Macron and John McCain. "Kim must not see weakness". "He can't do that". "The Prime Minister said nothing he hasn't said before - both in public, and in private conversations with the President".
Trump refused to sign a previously-negotiated joint statement written by all seven countries, prompting French President Emmanuel Macron to say in a statement Sunday that "International cooperation can not be dictated by fits of anger and throwaway remarks ..."
European members of the G7 unanimously oppose US President Donald Trump's call for Russian Federation to be readmitted into the club, French President Emmanuel Macron's office said on Friday. The EU trade surplus with the U.S.is $151 Billion, and Canada keeps our farmers and others out.
The US President is also making threats against Canada's dairy producers and automakers. "If you want to treat your friends like friends that's exactly what you do; you don't make arrangements face-to-face and then, as soon as the individuals left the building, talk behind their back".