Mr. Trump's tweets taking aim at the leader of a country that has always been a U.S. ally came after the President left the G7 summit in Canada to travel to Singapore ahead of a planned diplomatic meeting with North Korean Leader Kim Jong-un, CNN reported.
Leaders from Italy, the United Kingdom, Germany, France, the European Union and Japan attended a tense meeting this past Friday and Saturday at the G7 summit.
"Canada does not believe that ad hominem attacks are a particularly appropriate or useful way to conduct our relations with other countries", said Canadian foreign affairs minister Chrystia Freeland, according to the Toronto Star.
"I will always protect Canadian workers and Canadian interests", Trudeau said.
US President Donald Trump waves as he arrives to board Air Force One to depart for travel to Singapore from the Canadian Forces Base Bagotville, Quebec, Canada, on June 9, 2018. "That's what weak, dishonest Justin Trudeau did".
Trudeau had said Canadians "are polite, we're reasonable, but also we will not be pushed around".
He told the G7 leaders during the summit that the United States wanted a quick end to trade practices that he said have led to an exodus of American companies and jobs to other countries.
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Trudeau said Canada planned to retaliate after the Trump administration announced tariffs last month that will be coming as of July 1. Trump also accused Trudeau of dishonest behavior, claiming that his statements after summit had contradicted his behavior during their meetings. He described Trudeau's news conference as "sophomoric" and a "political stunt".
The fight isn't just with Trudeau and Canada but with the best allies of the U.S., Democratic Senator Dianne Feinstein of California said on CNN.
Trudeau used a media conference on Saturday to reject a USA demand for a sunset clause in the North American trade agreement, Nafta, that Trump has at different times pressed to abolish or renegotiate.
"It's going to change", he said.
Kudlow repeatedly charged Trudeau with the "betrayal" of Trump and other leaders of the G-7.
Earlier in the day, reports The New York Times, Trudeau said the seven nations had come to an agreement on several foreign policy and economic goals, but he noted that some disagreements with Trump, primarily those on trade, remained.
"I understand the president was upset", Mr. Feinstein told CNN.
Former prime minister of Canada, Stephen Harper, reacts to dispute between Trump and Trudeau at the G7 summit and discusses the North Korea summit on 'Sunday Morning Futures'.