"We are focused on everything we accomplished here at the summit".
Trump has previously threatened North Korea with military action if it "acts unwisely".
Earlier on Saturday, Trump told reporters it would be "very easy" to make the case for tariffs on auto imports using the rationale that they threaten national security.
Although Mr. Trump signed onto the communique for the G-7 summit, he tweeted afterward that he had instructed representatives "not to endorse" it after Trudeau's statements.
Trump himself told reporters on Saturday that the summit was not contentious and called his relationship with G7 allies a "10".
U.S. President Donald Trump and other G7 leaders had a bitter exchange over trade tariffs, ratcheting tensions at a summit that he planned to leave early on Saturday before talks on climate change and the health of oceans.
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 USA allies last week as part of his "America First" agenda, showered Trump with data one after the other. Trudeau says what the leaders did this weekend was "roll up our sleeves" and figure out language they could agree to on a broad range of issues. Trump said he had not spoken with Russian President Vladimir Putin in a while.
At the summit, Trump played a wild card, suggesting that rather than both sides boosting retaliatory tariffs - as he has just done on steel and aluminum - they could declare for entirely free trade in the G7 zone.
"We're the piggy bank that everybody is robbing".
Garcia confident she'll win a Grand Slam title
She will face either 2016 champion Garbine Muguruza or Lesia Tsurenko of Ukraine for a semi-final place. "I love playing Maria". Williams said she was gutted to miss out on facing her rival. "But as soon as I started playing, I thought "no, too soon".
Mr. Trump planned to leave the summit on Saturday before it discussed climate change and the health of oceans, underlining fractures in the G7 exacerbated by US trade tariffs.
The Trump administration announced two weeks ago that it would investigate whether auto imports hurt US national security, the first step toward tariffs similar to the ones he imposed on steel and aluminum imports last week. Mr Trump said the move would protect domestic producers that were vital to U.S. security.
Media captionDairy wars: Why is Trump threatening Canada over milk? -Canada border. He said unleashing 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".
Trump had come to Quebec insisting on his long-standing claim that America has been exploited for too long by existing trade arrangements - and he was met by counterparts equally determined to protect the "rules-based" worldwide system.
On Saturday, Mr. Trump arrived late for the first working session on gender equality but Canadian Prime Minister Justin Trudeau forged ahead with opening remarks without him, commenting wryly about "stragglers".
The communique, which appeared to have papered over the cracks that have surfaced in the G7, said the leaders of the United States, Canada, Britain, France, Italy, Germany and Japan agreed on the need for "free, fair, and mutually beneficial trade" and the importance of fighting protectionism.
"What worries me most, however, is the fact that the rules-based global order is being challenged, quite surprisingly not by the usual suspects but by its main architect and guarantor, the U.S.".
Donilon also criticized Trump for isolating the United States at a summit where it used to be the leader.
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