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.
And in Ottawa on Monday, International Trade Minister Francois-Philippe Champagne urged lawmakers to speed ratification of the Trans-Pacific Partnership that might offset losses in USA trade by binding Canada closer to Asia, Australia and Latin America.
Members of Parliament gave unanimous consent for a motion backing Canadian steel and aluminium, hit by USA tariffs, as well as the supply management system that supports key agriculture sectors, and gave a standing ovation for the government response to the Trump administration's verbal attacks on Trudeau.
Mr Navarro said Mr Trump "did the courtesy to Justin Trudeau to travel up to Quebec for that summit".
"Canada has been restrained throughout in dealing with a temperamental president and I think all the way through we've avoided rising to provocation and tried to deal with the facts", said McKenna. "We have been, our trade is a disaster, our trade deals".
Trump and North Korean leader Kim Jong-un converged on this island city state Sunday ahead of one of the most unusual and highly anticipated summits in recent world history, a sit-down Tuesday morning meant to settle a stand-off over Pyongyang's nuclear arsenal.
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"Canadians are polite, we're reasonable but we also will not be pushed around", he said.
Trump also called Trudeau "very weak and dishonest" following the summit.
"There's a special place in hell for any foreign leader that engages in bad faith diplomacy with President Donald J Trump and then tries to stab him in the back on the way out the door", Peter Navarro said.
While making no direct criticism of Mr Trump, Mrs May acknowledged that the summit had been "difficult" and told MPs she had expressed her "deep disappointment" at the "unjustified" imposition of tariffs on American imports of European steel and aluminium.
When Trump left Quebec, it was thought that a compromise had been reached, despite the tension and the determination of European leaders Macron and Chancellor Angela Merkel of Germany to push back against the United States president's protectionist policies. "We strive to reduce tariff barriers, non-tariff barriers and subsidies", it said, reflecting the typical language of decades of G7 statements. Mr Trump said the move would protect domestic producers that were vital to USA security.
The Trump-Trudeau scuffle represents a pivot away from the once-friendly relationship between the two leaders.
The report claims, according to press sources, both Canada and Mexico have dismissed the idea of bilateral deals, as have several key United States lawmakers. In the end, that language stayed in and it was only on climate change that no consensus was reached.