The summit comes after Trump slapped tariffs on steel and aluminum, and withdrew the U.S. from the 2015 Iran nuclear deal - actions which have enraged Washington's allies.
Canada is also frustrated by what it sees as unacceptable USA demands in talks to modernize the North American Free Trade Agreement, a deal that Trump has frequently criticized and threatened to terminate.
Trump's tweets came after Macron threatened to exclude the United States from the G-7 final statement to be issued in the mountainous tourism destination of Charlevoix. "I am heading for Canada and the G-7 for talks that will mostly center on the long time unfair trade practiced against the United States".
Top White House economic advisor Larry Kudlow opposed tariffs before joining Trump's team, but now says he agrees the trade status quo hurts America.
Trump walked along the grounds of the summit and then shook hands with Trudeau and his wife, Sophie Grégoire Trudeau.
As tempers frayed, Trump had a ready retort, via tweet: "Please tell Prime Minister Trudeau and President Macron that they are charging the US massive tariffs and create non-monetary barriers". Both Moscow and Trump have denied the allegations.
Alice Johnson Details Kim Kardashian's Call About Commutation
Alice Johnson speaks out on " Good Morning America ", June 7, 2018 , after her sentence was commuted by President Donald Trump . Kardashian West became interested in Alice Marie Johnson after she saw a Mic interview about her case. "It was wonderful.
"The introduction, for example, of restrictive tariffs on steel, on aluminum, not only for Europe but also for Canada and Mexico, in essence these are also sanctions..."
At last year's G7 summit in Sicily, the leaders all signed a communique, but the statement made clear there were deep differences on the Paris climate change accord. They found a way to praise him on North Korea, even if it was tempered by other complaints.
The War of 1812 was a conflict fought between U.S. and United Kingdom and their respective allies, when the White House was burnt down by the British. "France and North Atlantic Treaty Organisation - this is ridiculous to think that they could be a threat to the United States' security", Trudeau said.
The French president expressed support for Trump in his expected summit with the North Korean leader, Kim Jong-un, but also warned his abrogation last month of a 2015 multilateral deal on the Iranian nuclear programme had cast doubt on the credibility of such agreements. Ramaphosa is one of the developing world leaders, who have also been invited to the exclusive club.
Thursday night Trump fired at Trudeau for acting "so indignant" over tariffs. Issues such as gender equality and climate change will be major topics of discussion, particularly in light of the USA withdrawal from the Paris agreement.
Before arriving in Canada, British Prime Minister Theresa May called for fellow European Union leaders to take proportionate responses to the USA tariffs and shrugged off a rebuff by Trump for a formal one-on-one meeting at the G-7.
The disarray was enhanced when Italian Prime Minister Giuseppe Conte, who heads a right-wing populist party, tweeted his support for Trump's Russian Federation position.
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