On Saturday, he called the Canadian prime minister "very dishonest and weak".
Canadian Prime Minister Justin Trudeau then "acts hurt when called out!" I'll tell you this to my friends in Canada that was one of the worst political miscalculations of a Canadian leader in modern Canadian history.
Last month, Canadian Prime Minister Justin Trudeau announced his government would retaliate against Trump's tariffs by imposing import taxes on $12.8 billion worth of US imports in what Canada says its strongest trade action since the World War II.
Some are calling it part of the "the Trump curse", how bad and embarrassing things seem to befall those critical of President Trump.
Even Hollywood actor Robert de Niro was weighing in. "That's what weak, dishonest Justin Trudeau did".
And on Twitter, the hashtag #ThanksCanada was trending with Americans thanking their neighbours to the north for everything from Nanaimo bars to hockey to caring for airline passengers during 9/11. "I don't understand the obsession with trade relations with Canada", he said on Fox's "Sunday Morning Futures", given that Canada is the biggest single buyer of American goods and services in the world.
"POTUS is not gonna let a Canadian prime minister push him around, " Kudlow said.
Kudlow said the US and Trump was prepared to sign the G-7 communique drafted during the meeting until Trudeau "stabbed them in back" and made Trump look weak as prepared to meet with North Korean leader in Singapore.
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"Well, he holds a press conference and he says the U.S.is insulting".
Alongside Trudeau's eyebrows, the G7 summit also saw President Donald Trump lash out at the Canadian prime minister after he said that Canada would with "absolute certainty" impose retaliatory tariffs on USA goods.
The president said he was annoyed by Trudeau's comments about not letting Canada get pushed around.
Trump made his comments in a wide-ranging news conference in Singapore following his historic summit with North Korean leader Kim Jong Un.
According to US Census Bureau data, Canada was the top export destination for 32 states in 2016, by far the most of any country.
Ms. May ducked Mr. Corbyn's question and when later asked by Conservative MP Crispin Blunt: "Trudeau or Trump?", she smiled and replied: "I'm not sure what activity he's asking me to undertake with either of them".
Trump administration officials on Sunday accused Canadian Prime Minister Justin Trudeau of stabbing President Trump in the back, blaming him for the president's refusal to endorse a joint statement with other world leaders.
He did him a favour and he was even willing to sign that socialist communique.
French President Emmanuel Macron's office reacted Sunday by saying that "international cooperation can not be dictated by fits of anger and throwaway remarks". We'd have a deal, we'd have a great deal with NAFTA, by now, if the Canadians would spend more time at the bargaining table and less time lobbying Capitol Hill and our press and state governments here, they are just simply not playing fair.