U.S. President Donald Trump and Managing Director of the International Monetary Fund Christine Lagarde attend a G7 and Gender Equality Advisory Council meeting as part of a G7 summit in the Charlevoix city of La Malbaie, Quebec, Canada, June 9, 2018.
The two-day summit in Canada has been marred by fears of a trade war and tit-for-tat exchanges of hostile tweets, with USA trading partners furious over Mr Trump's decision to impose tariffs on steel and aluminium imports from Canada, the European Union and Mexico as part of his "America First" agenda.
Trudeau confirmed he had warned Donald Trump his country would impose retaliatory tariffs on United States goods from July 1, denouncing Trump's decision to invoke national security concerns to impose tariffs on aluminum and steel as "insulting" to the Canadian war veterans who had fought alongside U.S. allies.
"I have made it very clear to the President that it is not something we relish doing, but it is something that we absolutely will do", Trudeau said.
But, he said, the USA could no longer tolerate "brutal" deals, even threatening to tear up the North American Free Trade Agreement if he didn't get his way.
Trump recently imposed a 25 percent tariff on steel and a 10 percent tariff on aluminum imported from Canada, Mexico and the European Union.
At what a French described as one "extraordinary" session on Friday, leaders who had vowed to confront Trump over his decision to impose tariffs on US allies last week as part of his "America First" agenda, showered Trump with data one after the other.
French President Emmanuel Macron stared at Trump after he sat down.
Trade dominated the two-day summit that began on Friday with leaders of Germany, France, Japan, Canada, Britain and Italy returning to the topic repeatedly in meetings, at a lavish dinner and by a fireside pit late into the evening.
"We strive to reduce tariff barriers, non-tariff barriers and subsidies", they said in the statement. But I feel really confident", Trump said of Monday's meeting, which is the first between a North Korean leader and sitting US president, "It's never been done, It's never been tested.
But Trump's gambit, which his economic adviser Larry Kudlow told reporters amounted to a "free trade proclamation", called the other leaders' bluff - if they're so opposed to his new tariffs, he suggested, why not eliminate all tariffs?
Trump earlier had a bitter exchange with other G7 leaders over trade tariffs before leaving the summit ahead of talks on climate change and the health of oceans got underway.
"But, with that being said, Russian Federation should be in this meeting", he added.
Meanwhile, Canadian premier Justin Trudeau has warned that Trump's tariffs "are hurting his own citizens".
That leaves Trump diametrically opposed with Canada, which says renegotiating the deal every five years would create perpetual uncertainty and harm long-term investment.
He later said, "It's going to stop, or we'll stop trading with them". In a statement at the time the countries, which include the U.S., France, Canada, Germany, Italy, the United Kingdom and Japan, condemned Russia's actions as "illegal" and in "contravention of worldwide law".