All the group's leaders had spoken publicly about the summit and the Canadian government had issued the communique when Trump's tweets were posted.
Trump himself told reporters on Saturday that the summit was not contentious and called his relationship with G7 allies a "10".
Image copyright JESCO DENZE What was agreed?
President Donald Trump threw the G-7 summit into disarray Saturday, tweeting that the USA was pulling back its endorsement of the group's communique in part because of what he called Prime Minister Justin Trudeau's "false statements" at a news conference.
In an "extraordinary" exchange between the leaders on Friday, Mr. Trump repeated a list of grievances about USA trade, mainly with the European Union and Canada, a French presidency official told reporters.
At what a French described as one "extraordinary" session, leaders who had vowed to confront Trump over his decision to impose tariffs on USA allies last week as part of his "America First" agenda, showered Trump with data one after the other. Trudeau says what the leaders did this weekend was "roll up our sleeves" and figure out language they could agree to on a broad range of issues. "We're like the piggy bank that everybody is robbing".
In an "extraordinary" exchange between the leaders on Friday, Trump repeated a list of grievances about U.S. trade, mainly with the European Union and Canada, a French presidency official told reporters.
The U.S. president left before the end of the summit and will fly to Singapore for a meeting with North Korean leader Kim Jong Un, which he described as a "mission of peace".
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Leaders of the G7 nations on Saturday papered over the cracks in their alliance at a summit in Canada but came away with little more than an agreement to disagree on trade, as Trump defiantly brandished his "America First" agenda. "If it doesn't happen, we come out even better!" he added. Canada has promised retaliatory measures on July 1.
Media captionDairy wars: Why is Trump threatening Canada over milk?
His statements on the sidelines of the contentious G7 summit come just weeks after his administration slapped metals tariffs on Canada, the European Union and Mexico, who quickly announced their own retaliatory measures.
"It is evident that the American president and the rest of the group continue to disagree on trade, climate change and the Iran nuclear deal", Tusk told reporters ahead of the G7 summit in the Canadian town of La Malbaie, north of Quebec.
A member of Macron's team characterized the talks as "frank and robust", with Trump first repeating his lengthy diatribe about what he regards as unfair trade restrictions - before the Europeans responded with facts and figures they felt would blunt his argument.
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.
Russian Federation was suspended in 2014 because of its annexation of Crimea from Ukraine.
House Minority Leader Nancy PelosiNancy Patricia D'Alesandro PelosiOvernight Health Care - Sponsored by PCMA - DOJ move against ObamaCare sets off frenzy Overnight Health Care - Sponsored by PCMA - New White House ad campaign targets opioid addiction Pelosi: "Medicare for All" should be "evaluated" if Dems win House MORE (D-Calif.) chided Trump and his Commerce Department.