But shortly after Canadian prime minister Justin Trudeau said he was "happy to announce that we have released a joint communique by all seven countries" indicating that the USA was also included, Trump announced that Washington would reverse its decision and not sign the statement.
Trump had earlier lashed out at Canadian leader Justin Trudeau for what he said were "falsestatements" at a news conference and said the USA would not endorse the G7 communique.
White House economic adviser Larry Kudlow accused Trudeau of betraying Trump with "polarizing" statements on trade policy that risked making the US leader look weak ahead of the historic summit with Kim.
Trump's trade adviser Peter Navarro also lashed out on Sunday at Trudeau's statements, saying they represent "bad faith".
In recent weeks, trading partners of the U.S. have criticised new tariffs on steel and aluminium imports imposed by the Trump administration. Minimum is 17B. Tax Dairy from us at 270%.
After some intense discussion, Justin Trudeau was desperately trying to hammer out a Communique proclaiming the G7 a success with some common ground.
Kudlow said on CNN that Trump's reaction to Trudeau's comments has been "in large part" because he does not want "any show of weakness" ahead of that meeting.
President Donald Trump's call to bring Russian Federation back into a group of the world's major advanced economies drew opposition from both Democratic and Republican lawmakers who said Moscow shouldn't be rewarded for its bad - and unrepentant - behavior.
But when questioned about the USA imposition of tariffs on steel and aluminum, Trudeau reaffirmed his intention to retaliate on July 1 with equivalent tariffs.
"I just don't see anything wrong with the American president suggesting that the G7 go back and have another discussion with Russia", Kudlow said on CNN's "State of the Union".
"We acknowledge that free, fair and mutually beneficial trade and investment, while creating reciprocal benefits, are key engines for growth and job creation", the statement said. They report a really high surplus on trade with us. "And that's a very profitable answer, if we have to do it", Trump said in a bewildering press conference before he departed Canada, insisting that the summit was a success and the level of relationship he shared with the G7 leaders was a10 on a scale of one to ten. "Instead, we act then too".
From Singapore early Monday, Trump continued to tweet that the United States protected North Atlantic Treaty Organisation countries "these same countries that rip us off on Trade. We strive to reduce tariff barriers, non-tariff barriers and subsidies", it said.
"Not fair to the PEOPLE of America!" Canada is the top U.S. export market, with the country buying more than $340 billion in American goods and services in 2017, according todata from the U.S. Trade Representative.
James Brander, an worldwide trade expert at the University of British Columbia in Vancouver, said Freeland's comments were meaningful.