All three trading partners have threatened to retaliate with their own levies against US imports.
"The principle of a dialogue was agreed this afternoon", the French official told reporters.
It is worth noting, though, the shift in approval is not only by the leaders of foreign countries or about President Trump.
"In fact, I congratulate the leaders of other countries for so crazily being able to make these trade deals that were so good for their country and so bad for the United States".
"Something's going to happen. So we need to say, I think, before any such conversations can take place, Russian Federation needs to change its approach".
"We have to have deals that are fair", Trump said. "For the United States, frankly, it would be a good thing". An official described Merkel's suggestion as a "shared assessment and dialogue" mechanism, but gave no further details. It was unclear if the technical talks were part of her initiative.
"If they retaliate they are making a mistake because.they do so much more business with us than we do with them that we can't lose that".
The noise of Trump's helicopter landing was so loud they had to stop talking for a while, in a scene one official compared to the opening from the US television series M.A.S.H.
"It's highly unlikely there will be a final communique", a G7 official said on condition of anonymity.
He left before any resolution was announced on the traditional joint statement from the seven industrialized nations in the group, which in addition to the US and Canada includes Britain, Italy, France, Germany and Japan. The European Union also attends. At one point, German Chancellor Angela Merkel was seen having a brief, intense one-sided conversation with a stony-faced Trump on Friday. MORE strolled in late on Saturday to a breakfast meeting on gender equality at the Group of Seven Summit in Canada.
And after the Trudeau meeting Friday, the White House released a statement saying "the two leaders and their delegations are close to a deal on Nafta", while U.S. Trade Representative Robert Lighthizer said a few weeks ago that the nations are "nowhere near close to a deal". He reiterated his longstanding view that the USA has been taken advantage of in global trade, adding, "We're like the piggy bank that everybody's robbing and that ends".
The president defended the "national security" rationale for the tariffs.
He plans to leave the summit four hours earlier than originally planned to fly to Singapore to meet with North Korean leader Kim Jong Un, the White House said.
"I would say that the G8 is a more meaningful group than the G7, absolutely", Trump said.
The government announced it would impose more than $16.6-billion in retaliatory tariffs, effective July 1, on a variety of USA goods.
"Prime Minister Trudeau is being so indignant, bringing up the relationship that the US and Canada had over the many years and all sorts of other things. but he doesn't bring up the fact that they charge up to 300 percent on dairy - hurting our Farmers, killing our Agriculture!"
The spat has financial markets anxious about tit-for-tit escalation. "We have a serious problem with multilateral agreements, and that's why there will be contentious discussions", she said, per AFP.
Trump said the G7 leaders were united in their approach to the "threat of Iran" and committed to controlling the country's "nuclear ambitions". Moscow has denied the allegations.