Trudeau didn't answer the questions, responding to journalists at the photo op: "Good to see you guys". "It's a handsome evening, a great weekend".
Trudeau said Canada wasn't backing down.
At what a French presidential official described as one "extraordinary" session on Friday, leaders who had vowed to confront Trump over his decision to impose tariffs on USA allies last week as part of his "America First" agenda, showered Trump with data one after the other.
Trudeau's view of how the summit went was a marked contrast to Trump's take. "You want a tariff-free - you want no barriers, and you want no subsidies", he said.
"It would be with regret but it would be with absolute clarity and firmness that we move forward with retaliatory measures on 1 July", Mr Trudeau said.
The Canadian government official said there could be meaningful progress on less controversial issues at the summit such as economic growth, the environment and gender equality."We have no reason to believe there will be problems on those issues", the official said on condition of anonymity. He delivered that message personally during meetings with other leaders of the Group of Seven major economies, which took place in Canada on Friday and Saturday.
Despite this, he insisted his relationship with Western leaders was at a "10".
The comments come in the midst of Trump's ongoing trade war with allied nations. "And they understand it's going to happen", Trump said.
An official from French President Emmanuel Macron's office said there was still hope a joint communique would be signed, with Washington opting out of clauses on climate and the environment, but that U.S. negotiators are opposing language on strengthening worldwide trade oversight.
Trump said: "If they retaliate they are making a mistake".
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Heading into the leaders' summit in the Quebec town of La Malbaie, there were deep concerns the G7 was fast becoming a G6 plus one because of a widening gulf between the US and the rest of the group in key areas such as climate and trade. He later added, "It's going to stop".
Trudeau also said that Canada will not agree to a "sunset clause" in negotiations for NAFTA.
The suspension was supported by the other members of the group, including the US, Canada, Japan and four European nations. A source within the French presidency said Trump's proposal did not seem "coherent", and that it would be discussed in Quebec.
The source said: "We should remind ourselves why the G8 became the G7 - it was after Russian Federation illegally annexed Crimea".
In retrospect, the consensus had appeared shaky from the outset, and even as Trump flew out it was clear that the summit had failed to heal the rift on trade.
Thursday, Trump took aim at Trudeau and Macron, accusing them of benefiting from one-sided trade arrangements with the United States. "I might have had a very different" response, Trump said. He said he'd probably know within the first minute of his sit-down with Kim whether he can make a deal.
His early departure from the G7 meant he will miss sessions on climate change and the environment.
All seven countries agreed to a joint statement on artificial intelligence, global trade, middle class growth, innovation, girls' education, and defending democracies from foreign intrusions. He says "we're not looking to play games". Trump said Friday he thinks the group will produce a joint statement.
The G7 summit came after the Trump administration announced last week to impose tariffs on steel and aluminum imports from the European Union (EU), Canada and Mexico, which has drawn strong opposition from the domestic business community and quick retaliation from USA major trading partners.