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The US President launched his broadside after leaving a G7 summit of world leaders hosted by Mr Trudeau in the Canadian province of Quebec.



He also announced he was backing out a joint G7 communique which attempted to paper over the escalating trade dispute by advocating “a "rules-based trading system".



Mr Trump tweeted: "PM Justin Trudeau of Canada acted so meek and mild during our @G7 meetings only to give a news conference after I left saying that, 'US Tariffs were kind of insulting' and he 'will not be pushed around.' Very dishonest & weak. Our Tariffs are in response to his of 270% on dairy!



“Based on Justin's false statements at his news conference, and the fact that Canada is charging massive Tariffs to our US farmers, workers and companies, I have instructed our U.S. Reps not to endorse the Communique as we look at Tariffs on automobiles flooding the U.S. Market!"

US President Donald Trump lashed at Canadian PM Justin Trudeau in a series of tweets

The comments to which Mr Trump referred were made in a press conference Mr Trudeau gave in which he spoke of retaliatory measures which Canada would take next month in response toTrump's decision to slap tariffs on metal imports from Canada, Mexico and the European Union – 25 percent in the case of steel, 10 percent in the case aluminium.



Mr Trudeau told reporters: "Canadians, we're polite, we're reasonable but we also will not be pushed around.”



Reacting to Mr Trump's tweets, Trudeau's office said: "We are focused on everything we accomplished here at the summit.



“The Prime Minister said nothing he hasn't said before – both in public, and in private conversations with the President."

Mr Trump's tweet took aim at Mr Trudeau

Mr Trump's salvo capped a dizzying two days of controversies that began with his suggestion Russia be readmitted to the G7, then what a French official described as a "rant" full of "recriminations" against US trading partners, followed by Mr Trump’s denial of any contention with leaders at the summit and his description of their relationship as a "10."



The communique said the leaders of the United States, Canada, Britain, France, Italy, Germany and Japan agreed on the need for "free, fair, and mutually beneficial trade" and the importance of fighting protectionism, adding: "We strive to reduce tariff barriers, non-tariff barriers and subsidies.”



Mr Trump's reversal, announced while en route to Singapore for a meeting with North Korean leader Kim Jong Un, has left G7 partners flummoxed.



A European official, speaking on the condition of anonymity, said: "We stick to the communique as agreed by all participants.”

French President Emmanuel Macron labelled the summit a success – before Mr Trump's tweets

Speaking before Mr Trump’s tweets, French President Emmanuel Macron had labelled the summit a success, saying there was relief within the G7 that an escalation of the trade dispute had been avoided.



He said: “The nature of the debate we had was rather appeasement and it stopped the escalation in terms of behaviour.”



Prior to this latest spat, Mr Trudeau, a self-proclaimed progressive liberal and feminist, has attempted to forge a cordial relationship with Mr Trump since he beat Hillary Clinton to the Presidency in 2016.



He has avoided being overtly critical of the US President in the wake of his various controversial statements, although he was also widely believed to have “beaten” Mr Trump’s infamous “power handshake” when the two met in February of last year.

G7 summit 2018 in pictures: World leaders unite in Canada Sat, June 9, 2018 The G7 Summit runs from 8 to 9 June in Charlevoix, Canada. Play slideshow REUTERS 1 of 38 U.S. President Trump attends a G7 and Gender Equality Advisory Council meeting

Big tough guy once he's back on his airplane Former Justin Trudeau adviser Roland Paris