"We have little tests every once in a while when it comes to trade", Trump said, expressing optimism without details that "something is going to happen" on that front.
"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.", Tusk said as the summit got underway in the Quebec resort town of La Malbaie, on the banks of the St. Lawrence River.
Trade was a massive issue at this year's summit with Canadian Prime Minister Justin Trudeau and President Trump butting heads.
Unable to persuade Trump to consider ways to stay in the Iran nuclear deal, and stung by USA tariffs on European steel and aluminum, Macron appeared to be recalibrating his approach to Trump.
Seven world leaders met Friday and Saturday in Charlevoix, Quebec for what is known as the G7 summit.
Describing her impression from Trump's behavior at the summit as "disillusionment", Merkel said that "we will not allow ourselves to be deceived again and again" and that Europe will not permit the American president to do "whatever he pleases".
The plan, first reported by the USA news magazine The New Yorker, aims to strengthen the European Union and assess whether the changes enacted by Mr. Trump are part of a structural shift in U.S. foreign policy.
His comment sparked a new diplomatic spat between Trudeau and the Trump administration and led Chancellor Merkel to criticize Trump's handling of the matter.
Though other leaders had their own images of the meeting tweeted out, Denzel's photograph - which shows Merkel standing dominantly over a petulant-looking Trump - became the most enduring after it caught the imagination of the web.
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Trump plans to brief reporters following the summit's conclusion, and will leave for the USA around 8pm local time (midnight NZT). But he said that any past US president could have gotten a one-on-one meeting with the leader of North Korea .
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Although Trump said the tariffs are necessary to protect USA industry and workers, Canada and the European Union have denounced them as illegal and are preparing retaliation, raising the prospect of a tit-for-tit escalation.
Trump greeted Justin Trudeau, the prime minister of Canada, warmly at the official opening of the gathering.
One solution, Merkel said, might be for Trump to withhold his signature from a final document.
Trump also lashed out at long-time allies over their criticism of his trade policies.
Faced with an erratic United States president, Germany is changing tactics.
The G7 nations are Canada, France, the United States, the United Kingdom, Germany, Japan and Italy.
It was a picture that, by several accounts, summed up the tense G7 summit over the weekend in Quebec, Canada.
Trump has long argued that the U.S. is trapped in a number of trade deals that put the country at a competitive disadvantage.
If there was any hope the fissures might be repaired before Trump arrived, it was dashed on Friday morning when the President told reporters he was open to reinstating Russia's participation in the group, which was suspended after Moscow's incursion into Ukraine in 2013.