Mr. Trump addressed the subject of global trade during an impromptu news conference at the summit on Saturday, saying that he does not want to see other countries take advantage of the U.S. over trade.
"Canadians are polite and reasonable, but we will also not be pushed around", the prime minister said.
"Very dishonest and weak".
"It's going to change", said Trump. It was unclear if the president was speaking specifically about Russia's invasion of Ukraine, or simply its claims in Crimea.
Larry Kudlow, director of the National Economic Council, lashed out at Canadian Prime Minster Justin Trudeau as "amateurish" and "sophomoric" for a news conference he gave after Trump left the Group of Seven summit on Saturday.
Trudeau didn't respond to questions about Trump when the prime minister arrived at a Quebec City hotel on Sunday for meetings with other world leaders.
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In an "extraordinary" exchange between the leaders on Friday, Trump repeated a list of grievances about USA trade, mainly with the European Union and Canada, a French presidency official told reporters.
Trump has infuriated the European Union, Canada and Mexico by imposing tariffs on steel and aluminium imports, accusing all of having shortchanged the United States in trade deals.
Kudlow said Kim must not see "American weakness" on the eve of the Tuesday summit.
"I have instructed our U.S. Reps not to endorse the Communique as we look at Tariffs on automobiles flooding the U.S. Market!", Trump tweeted Saturday evening while en route to Singapore aboard Air Force One.
"Is that really how we want to deal with our second biggest trading partner?"
Trump said in another tweet that Trudeau was "meek and mild" during their private meeting, only to hold a news conference calling the US tariffs "insulting".
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"We had some strong, firm conversations on trade and specifically on American tariffs".
In addition to his decision to double down on tariffs, prompting concerns of a global trade war, Trump suggested Russian Federation should re readmitted to the G7.
Der Spiegel, the German weekly, called Trump's performance in Quebec "a scandal without precedent" and said that German Chancellor Angela Merkel and other traditional USA allies must now be prepared for anything - especially on trade, a topic dear to German hearts.
The G7 also endorsed Britain's accusation that Moscow was behind the poisoning attack in England on former double agent Sergei Skripal and his daughter - but Putin said they had "again" failed to provide evidence that Russian Federation was behind the attack.
In much of the European press, the tendency was to underscore the historical significance of the rift between the United States and its continental allies.
He insisted, like Trump himself has done many times, that Canada has enormous tariffs itself - especially on certain dairy and food products.
The G7 countries, in the communique, "acknowledge free, fair, and mutually beneficial trade is a key engine for growth and jobs", and commits these nations to modernize the World Trade Organization (WTO).
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