President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on Thursday lashed out at the leaders of France and Canada over roiling trade disputes, setting the stage for a confrontational Group of Seven summit of major economic powers.

A day before leaving for the meeting in Canada, Trump singled out French President Emmanuel Macron and Canadian Prime Minister Justin Trudeau on Twitter for threatening to isolate the U.S. over his efforts to change global trade rules.

“Please tell Prime Minister Trudeau and President Macron that they are charging the U.S. massive tariffs and create non-monetary barriers,” Trump wrote. “The EU trade surplus with the U.S. is $151 Billion, and Canada keeps our farmers and others out.”

The president added: “Look forward to seeing them tomorrow.”

Please tell Prime Minister Trudeau and President Macron that they are charging the U.S. massive tariffs and create non-monetary barriers. The EU trade surplus with the U.S. is $151 Billion, and Canada keeps our farmers and others out. Look forward to seeing them tomorrow. — Donald J. Trump (@realDonaldTrump) June 7, 2018

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The message shows the depth of Trump’s unhappiness about the summit, where he is expected to take major backlash over his trade policies.

Macron and Trudeau met in Ottawa, Canada, this week ahead of the summit and presented a united front against Trump’s tack toward protectionism.

Asked during a joint press conference if Trump does not care about "being isolated" from other world leaders, Macron responded, "Maybe, but nobody is forever."

“The six countries of the G-7 without the United States, are a bigger market taken together than the American market," Macron said.

Macron threatened to sign a joint communique at the conclusion with the summit with five other nations — but not the U.S. — expressing their desire for free trade.

“The American President may not mind being isolated, but neither do we mind signing a 6 country agreement if need be,” he tweeted. “Because these 6 countries represent values, they represent an economic market which has the weight of history behind it and which is now a true international force.”