After leaving the summit Saturday, Trump announced that the US was pulling back its endorsement of the G7 communique in part because of what he called "false statements" at a news conference by Canadian Prime Minister Justin Trudeau.
Trump also took aim at Canadian Prime Minister Justin Trudeau and said he might double down on import tariffs by hitting the sensitive automobile industry, throwing G7 efforts to show a united front into disarray.
Donald Trump, in a tirade against countries he said are "robbing" the U.S., targeted India once again on import tariffs, as he left the G-7 summit in Canada on bitter terms. He also said that because of Trudeau's comments, he instructed US trade representatives to not sign the communique the G-7 leaders had agreed upon expressing the need for "free, fair, and mutually beneficial trade".
Trump called Trudeau "meek and mild" and "dishonest and weak" in a tweet for his stance on tariffs.
German Chancellor Angela Merkel has lambasted the US President Donald Trump's decision to renege on the G7 joint statement.
"There's a special place in hell for any foreign leader that engages in bad faith diplomacy with President Donald J. Trump and then tries to stab him in the back on the way out the door", Navarro said. Tell us in the comment section below.
The summit will be the first meeting between Trump and Kim and mark a turnaround of relations between the two leaders after a long-running exchange of furious threats and insults.
Harper himself took to Fox News this weekend to criticize Trump's actions at the G-7.
"There remain good reasons to fight for the transatlantic partnership", she said, adding that the current round of trade tariffs that the United States and European Union have imposed on each other did not signal the end of a partnership.
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"Canada has already raised cases at the WTO and at NAFTA, and we will retaliate", she said.
The EU has "a $151 billion surplus" which it should use to fund "military", said Trump Monday, referencing what Trump believes is the US' outsized financial contribution to North Atlantic Treaty Organisation.
Europe will not let Trump do "whatever he pleases", the German chancellor said, adding that "we will not allow ourselves to be deceived again and again".
Earlier this year, Mr Trump had criticised India over import duty on the iconic Harley-Davidson motorcycles and had threatened to increase the import tariff on "thousands and thousands" of Indian motorcycles to the US.
After Trump's angry tweets, Trudeau's office issued a brief response: "We are focused on everything we accomplished here at the G7 summit".
The president concluded his tweetstorm by saying, "Sorry, we can not let our friends, or enemies, take advantage of us on Trade anymore".
Nearly as an afterthought, Trump - now in Singapore for a summit with North Korean leader Kim Jong-un - tweeted: "Great to be in Singapore, excitement in the air!" "The European Union is brutal to the United States".
Before he was elected Canadian prime minister, Justin Trudeau faced a consistent type of criticism from his opponents: he was too young and too eager to please, conservatives said.