Trump pulled out of endorsing a joint communique after the G7 meeting finished on Saturday, with the U.S. president accusing Trudeau, the summit's chairman, of dishonesty.
Trade was a massive issue at this year's summit with Canadian Prime Minister Justin Trudeau and President Trump butting heads. The New York Times reported that Trump has defiantly refused to sign the trade agreement or verdict signed by all nations present at the summit.
In an attack on Canada's "very dishonest and weak" Prime Minister Justin Trudeau, Mr Trump revealed he was tearing up the agreed communique from the G7 gathering in Charlevoix, Canada.
Mr Trump, who left the summit in La Malbaie early to head for his talks with North Korean leader Kim Jong Un, told reporters the U.S. needed protectionist tariffs because "we are like the piggy bank that everyone is robbing".
"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, during an appearance on Fox news.
Nearly 18 months into Trump's presidency, Merkel's comments offered renewed evidence of Germany's struggle to adapt to an upended relationship with the US.
Canada and European countries condemned the United States for its "insulting" tariffs, and the latter in response refuted Canada's "false statements", following the Group of Seven (G7) summit in Quebec, Canada.
Trump withdrew the United States from the global deal reached in Paris in December 2015 to curb global warming, and last month from world powers' July 2015 nuclear deal with Iran, asserting that it was one-sided in Tehran's favour.
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She also said the European Union would "act" against the US trade measures.
Following the G7 summit, Trump set off for Singapore to meet with North Korean Supreme Leader Kim Jong Un.
China and the United States have averted a trade war by reaching an agreement last month under which Beijing has agreed to "significantly increase" its purchases of American goods and services to reduce $375 billion trade deficit with Washington.
"Canadians are polite and reasonable but we will also not be pushed around", Trudeau said.
The acrimonious fallout from the G7 began after Mr Trump watched Mr Trudeau's end-of-summit press conference.
But Trudeau later contradicted the president: "We will not, can not sign a trade deal that expires every five years".
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".
The text does reiterate the US commitment to "advancing sustainable economic growth, and underscores the importance of continued action to reduce air and water pollution", although it provides no details of how this tallies with the US Environmental Protection Agency's on-going efforts to roll back water and air regulations.