A later statement, released by a member Mr Trudeau's communications team on Twitter, said there was nothing new in the Prime Minister's press conference.
Trump appeared to have taken notice and pushed back: "Please tell Prime Minister Trudeau and President Macron that they are charging the US massive tariffs and create non-monetary barriers", Trump said in a tweet.
"In short, a long, frank rant which is undoubtedly very unusual in this kind of formats", the official added. "Our Tariffs are in response to his of 270% on dairy!" the USA president tweeted.
The Elysee Palace was responding to questions about the outcome of the summit, after US President Donald Trump refused to give his backing to a joint declaration, despite hours earlier signing the communique.
In a statement issued following Mr Trump's tweets, Mr Trudeau said he remained focus on what was accomplished at the G7 summit.
Trump's latest verbal counter-punch came in response to comments made by Trudeau at the press conference, in which he threatened to torpedo negotiations on a new NAFTA deal if the United States did not remove the steel and aluminum tariffs. "The Prime Minister said nothing he hasn't said before - both in public, and in private conversations with the President".
Verstappen posts more fast times in Canadian GP practice
The Finn added: "It's always annoying when it's so close and we're not ahead - but starting on the front row is good for this race".
The US president also repeated his call for Putin to join the other leaders around the summit table.
Trump sensationally withdrew his endorsement of their joint statement following the major global gathering.
"International cooperation can not be dictated by fits of anger and throwaway remarks", the Elysee Palace said.
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Mr Trump earlier warned his counterparts against retaliation after the United States imposed tariffs on steel and aluminium from Europe, Mexico and Canada - saying they would be "making a mistake". "And that ends", Trump said.
"If they retaliate, they're making a mistake", Trump declared before departing the annual Group of Seven summit in Canada for his meeting with North Korea's Kim Jong Un in Singapore on Tuesday.
He said US farmers had been harmed by tariffs and other barriers and warned that USA trading partners would need to provide him with more favorable terms.
"You say the U.S. President doesn't care at all".
There was also an agreement to disagree on climate change in the wake of Trump's decision to leave the Paris climate accord a year ago which further underlined the divide between the Group of Seven's powerhouse and its six co-members.