President Donald Trump took more swipes at Canada and its prime minister over trade issues as he settled in for a summit with North Korea in Singapore, contending that "Fair Trade is now to be called Fool Trade if it is not Reciprocal."
In tweets, Trump insulted Trudeau as "dishonest" and "weak."
German Chancellor Angela Merkel, who also attended the summit, told German public television that she found Trump's tweet disavowing the G-7 statement "sobering" and "a little depressing."
At one point he wrote, "Justin acts hurt when called out!"
"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," Trump trade adviser Peter Navarro said on "Fox News Sunday."
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In response to the initial tweets critical of her country and prime minister, Canada's foreign minister, Chrystia Freeland, said her nation "does not conduct its diplomacy through ad hominem attacks."
Freeland later told reporters that "we don't think that's a useful or productive way to do business."