The US leader had left the summit early en route for Singapore and a historic nuclear summit with North Korea's Kim Jong Un, only to take exception to comments made by Canada's Prime Minister Justin Trudeau at a news conference on the ground in Quebec.
Besides the escalated risk of a trade war, Trump's blistering personal attack on Trudeau poses domestic economic and political risks for the Canadian prime minister, who has stuck to a conciliatory stance in the face of USA threats on NAFTA and other bilateral trade cases.
President Trump concluded his visit to the Group of Seven summit on Saturdaywith warnings to USA allies, saying if they don't eliminate barriers to trade, they could lose access to the US economy.
Mrs May said: "Where we disagree with our allies on something it is right that we say so and air the issue openly and frankly".
"We have a tremendous trade imbalance", Trump said during Saturday's press conference.
While the two men have had several seemingly congenial meetings and phone calls since Trump took office, they could not be more different in terms of policy, with Trudeau a progressive liberal, outspoken on feminism and the merits of diversity and who was close to former president Barack Obama.
"If they retaliate, they're making a mistake", Trump declared before departing the annual Group of Seven summit, which includes Britain, Italy, France, Germany and Japan.
He said USA farmers had been harmed by tariffs and other barriers and warned that US trading partners would need to provide him with more favorable terms. 45 of 50 U.S. states export more to the European Union than they do to China.
Fellow G7 leaders stared at Trump as he slowly made his way to his seat, which was across the table from Trudeau and next to International Monetary Fund managing director Christine Lagarde.
Son of Ryan O'Neal and Farrah Fawcett charged with attempted murder
Hours later, on May 3 at 3:30 a.m., he allegedly got into another fight with a stranger and punched him repeatedly. Redmond O'Neal is being held in connection with a violent crime spree in southern California that unfolded in May.
UPDATE: Trudeau has responded to Trump's tweets.
Alluding to the tensions as he sat with Macron on Friday, Trump said: "We've had, really, a very good relationship, very special".
European officials said Trump had tried to water down the language in the draft communique on the WTO and rules-based trade.
Comey has been highly critical of Trump since the president fired him previous year, including in his new book "A Higher Loyalty: Truth, Lies, and Leadership".
"Canadians are polite and reasonable but we will also not be pushed around", he said.
As for the prospect of new trade deals touted by the Trump administration, Alden says they are a pipe dream.
Trump himself insisted relationships with allies were a "ten" just before he left the summit.
Trump will meet with Macron and Trudeau face-to-face on Friday.
"Germany stands by the jointly agreed communique", Steffen Seibert said in a short statement. In fact, Russian Federation was expelled from what was then the G-8 after its invasion and annexation of Crimea and its support for pro-Russia separatists in Ukraine.
The Charlevoix G-7 summit was marked by sharp disagreements over Trump's decision to impose higher import taxes on aluminum and steel imports.
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