As tweeted by Trump: "based on Justin Trudeau's false statements at his news conference and the fact that Canada is charging massive Tariffs to the USA farmers, workers and companies", the U.S. president has instructed representatives, officials and lawmakers in the United States not to endorse the final G7 communique.
In a followup tweet, Trump targeted Trudeau again, saying he "acted so meek and mild during our @G7 meetings only to give a news conference after I left saying that, "US Tariffs were kind of insulting" and he 'will not be pushed around'".
Reneging on the commitments agreed in the communique showed "incoherence and inconsistency", it said in a statement. Later, the document was made public.
"Very dishonest & weak", the president said.
Meanwhile, President Trump said Saturday that renegotiations on NAFTA could lead to a new trilateral trade deal with substantial changes or two separate trade agreements.
Former FBI Director James Comey also weighed in, tweeting Saturday night on the US-Canadian relationship.
It started on CNN's "State of the Union" when Trump economic adviser Larry Kudlow said the White House was angered by Trudeau's comments during the news conference that Canada must stand up for itself and that recently imposed us tariffs on steel and aluminum are "insulting".
Trump said the leaders discussed the question of Russia's inclusion in the group but reached no conclusion.
"Trump did not want to be isolated", Macron said.
Trump had entered the summit amid a spat with Trudeau and French President Emmanuel Macron over us tariffs on steel and aluminum. "There are no grounds whatsoever for bringing Russian Federation with its current behavior back into the G7", said Canadian Foreign Minister Chrystia Freeland.
Mr Trump had earlier denied that the summit had been contentious, contradicting what one G7 official described as a bitter harangue between the US President and his counterparts over tariffs.
Italian Prime Minister Giuseppe Conte took a clear swipe at the blow stating Vladimir Putin should be allowed back to the most exclusive club of world leaders.
He touted the "great meetings and relationships", and said that the other leaders "understand where I am coming from".
"We make commitments and keep them", the presidency said, adding that "France and Europe maintain their support for this (G7) statement".
Trump has pointed to Canadian Prime Minister Justin Trudeau's criticism of him as a reason for withdrawing from the consensus statement.
But Conte said before the meeting began that Rome would have undertaken "a moderate line" over the trade dispute. "Tariffs will come way down".
He said the country won't hesitate to impose its own retaliatory tariffs. "Americans stand with you, even if our president doesn't", he wrote.