On the subject of Russia, Trump said he thought it would be "an asset" to have the country in what would be the G8. On Friday, Mr Trump made a surprise call for Moscow to be readmitted, but German Chancellor Angela Merkel said other members were against the idea.
Russian President Vladimir Putin is now in Beijing, where he was presented with a friendship medal by Chinese counterpart Xi Jinping.
When Trump was pressed about the annexation of Crimea, he placed the blame on President Barack Obama for failing to handle the situation. Russian Federation was expelled from the group - which now includes France, Canada, Germany, Italy, Japan, the United Kingdom and the US - following its annexation of Crimea in 2014.
Trump says he will depart shortly for Singapore on a "mission of peace".
President Trump said he expects something will happen on trade, and that it will be positive.
Mr. Trump left early for a landmark meeting with North Korea's leader.
Trump told reporters he pressed for "fair and reciprocal" trade practices at the G-7 meeting in Canada, urging his foreign counterparts to eliminate all tariffs, trade barriers and subsidies in their trading practices. "There are no grounds whatsoever for bringing Russian Federation with its current behavior back into the G7", said Canadian Foreign Minister Chrystia Freeland.
A key question was whether the seven countries could agree on a joint statement of priorities at the conclusion of the meeting.
Trudeau told Trump that it was "unacceptable" to cite national security when targeting a military ally like Canada.
Canadian GP: Sebastian Vettel on pole position as Lewis Hamilton struggles
Stroll touched a wall in the morning session, forcing a stop for repairs, but was back out for a full run in the afternoon. It's hard not to feel some sympathy for Max Verstappen as he works through a turbulent period of his Formula 1 career.
European Council President Donald Trump accused Trump of challenging the "rules-based worldwide order", and suggested his policy "makes no sense at all".
She said: "Where we disagree with our allies on something it is right that we say so, and air the issue openly and frankly".
Putin indicated that he did not like "a lot" of the United States authorities' decisions but praised Trump for his consistency.
Trump's recent moves, building on 18 months of nationalist policy-making, leave him out of step with the globally minded organization and prompted speculation that the group could fracture into something more like the "G-6 plus one".
The President had expressed displeasure at having to the attend the summit, a gathering that began Friday in this town outside Quebec City amid tensions over the Trump administration's imposition of metals tariffs on U.S. allies.
The spokesman added, there are no concrete agreements or understandings, and no specific discussions are being conducted now.
He did not back away or blunt his critiques, and despite first-name references to "Angela", and "Justin", Trump did little to disguise his distrust of the global consensus model of world affairs that the G-7 represents. Canada, Mexico and the European Union all threatened retaliatory tariffs after their exemption status was lifted.
Canadian Prime Minister Justin Trudeau insists the Trump hard line will only hurt the U.S. He says gender equality must "cut through" everything the G-7 does.
The leaders of the G7 on Saturday (Jun 9) failed to heal a tariff dispute that has pushed them to the brink of trade war, as Donald Trump quit their summit early and warned Canada, Japan and Europe that "the gig is up".
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