"This is probably not because he does not understand, but because of domestic reasons", said the official, who spoke on condition of anonymity.
Macron came to Ottawa ahead of the G7 summit in part to talk strategy with Trudeau on how to deal with a mercurial president who likes to be liked.
"It's highly unlikely there will be a final communique", a G7 official said on condition of anonymity. The nuclear agreement included Germany and the five permanent members of the United Nations Security Council, which includes France and Britain - all G7 members.
President Donald Trump and Japanese Prime Minister Shinzo Abe shakes hands during a news conference in the Rose Garden of the White House in Washington, June 7, 2018. A gathering of G-7 finance ministers days earlier concluded last week with a message of "concern and disappointment" for Trump from the other six countries.
He said: "Naturally we cannot force the USA to change their minds". US President Trump is expected to leave the summit early to fly to Singapore, skipping the climate session.
At one point, Macron waxed on about the apparent negative effect of USA hegemony, and suggested nothing short of sheer human mortality and the sweep of history would undo Trump's decision to dump the climate accord that was struck in the French capital nearly three years ago.
The G-7 summit is shaping up to be the most acrimonious in years, putting pressure on Justin Trudeau as host to bridge a divide between Trump and Europe, with Japan's Shinzo Abe poised to fall somewhere in the middle.More news: Serena Williams Quits French - Was It Injury Or…
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Merkel and Trump also had a brief conversation at the summit.
He said "on most fronts", the G7 was united in its efforts, including countering the aggressive stance of Russian Federation, securing denuclearisation on the Korean Peninsula and finding a way to end the long-running Syrian civil war. "Ask this great lady". "America first is more and more looking like America alone". It is been reported that, in a phone call between the two leaders, Mr Trump wrongly accused Canada of "burning down the White House in 1812" as partial justification.
Trump's rejection of the global climate accord and Iran nuclear deal, supported by the European Union and Canada is going to be another flashpoint in the increasingly acrimonious relationship between Washington and its Western allies. Canada vowed to hit the USA with almost $17 billion worth of tariffs on various goods from the US, such as toilet paper and maple syrup, and the European Union announced planned duties as well.
The spat has financial markets anxious about tit-for-tit escalation.
The comments followed a string of tweets from the president railing against Canada, France and other European allies for what the president has described as an imbalanced trade relationship.
At a photo op at the start of a head-to-head meeting with Mr. Trudeau, Mr. Trump joked that "Justin" had agreed to drop all trade tariffs, then insisted the two countries are making progress on North American free-trade agreement trade talks.
On Friday, Foreign Minister Chrystia Freeland said the Canadian government would not back down. Ben Sasse (R-NE), one of several Republicans to hit back at Trump's suggestion.
A Kremlin spokesperson meanwhile said they were interested in "other formats", apart from the G7.