Donald Trump accused the European Union of a "brutal" approach to trade with the United States and warned that retaliating to American steel tariffs would be a mistake.
Throughout the summit, photographers captured photos of the tension between Trump and other world leaders.
In the run-up to the G7 summit, Trump continued to rile up his fellow world leaders with accusations of unfair trade practices, provoking angry responses from both Trudeau and French President Emmanuel Macron, who even suggested that the G7 could fare as the G6, without the USA if need be. He will miss the climate session of the G7 summit.
Soon afterwards, Trump rejected in a series of angry tweets from Air Force One the text of a G7 consensus statement - traditionally a paean to shared Western values and objectives under American leadership.
Trump said he pushed for the elimination of trade barriers, including subsidies and tariffs, at the G-7 meeting. Angela and Emmanuel and Justin, I would say the relationship is a 10. "I think it will be very positive", Trump said, without giving details.
He said the trade deficits that the US faces "with virtually every country in the world" is the fault of past leaders. "It just got worse and worse and worse".
And Roland Paris, a former foreign policy adviser to Mr Trudeau, jabbed at Mr Trump on Twitter: "Big tough guy once he's back on his airplane".
"I will blame them if they don't act smart and do what they have to do because they have no choice", he said. In it, Merkel stares coldly, both hands braced on a table, at a defiant United States president Donald Trump, who is seated with his arms crossed. "I don't think that ratcheting up the rhetoric is going to improve things".
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"We're looking for peace in the world, we're not looking to play games".
Russian Federation was pushed out of what was then the G8 after it annexed Crimea from Ukraine in 2014.
"We were very close to making a deal with Canada on NAFTA ... then we leave and he pulls this sophomoric political stunt for domestic consumption", Kudlow said of Trudeau.
The UK is thought to have concerns about the European Commission's proposed package of 2.8 billion euro (£2.46 billion) of tariffs on USA goods.
"Russia is focused on other formats, apart from the G7", Kremlin spokesman Dmitry Peskov said in a brief statement reported by the government-controlled Sputnik news agency. Our Tariffs are in response to his of 270% on dairy!
Trump is issuing a stern warning to foreign countries not to retaliate against U.S. tariffs on the imports of steel and aluminum.
"Ultimately that's what you want", Trump remarked.