"We're like the piggy bank that everybody's robbing, and it ends", Mr. Trump told reporters at a press conference at the end of the meeting, just before he jets off to Singapore to meet with North Korea's leader.
Tweeting from Singapore where he's scheduled to hold a nuclear summit with North Korean dictator Kim Jong Un, Trump wrote: "Sorry, we can not let our friends, or enemies, take advantage of us on trade anymore".
"Donald Trump may think that his outrageous behavior is softening up his trading partners but it's not working with Canada", said Roland Paris, a former Trudeau adviser and professor of worldwide affairs at University of Ottawa.
Navarro took Kudlow's comments one step further, telling Fox News' Chris Wallace that "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 ..." If this is how Trump treats his closest allies, why would Kim Jong Un believe anything he hears at the negotiating table this week, especially after Trump has already pulled America out of existing global agreements?
"There had to be an agreement someplace that the president clearly felt other members had clearly violated, or at least the prime minister had violated", Rounds said.
Mr. Trump addressed the subject of worldwide trade during an impromptu news conference at the summit on Saturday, saying that he does not want to see other countries take advantage of the United States over trade.
North Atlantic Treaty Organisation is in crisis after US President Donald Trump questioned the future of the 69-year-old military alliance, attacking European countries for failing to pay their fair share towards the continent's defence.
"Our Tariffs are in response to his of 270% on dairy!" the USA president tweeted.
But the response by US lawmakers, business executives and officials falls short of the concerted and effective nationwide pressure campaign Canadian officials had hoped would be launched if a major threat developed.
"Trudeau did not make President Trump look weak", Hayden said on CNN Newday Monday.
"What I saw Prime Minister Trudeau say was, I thought, fairly benign and certainly didn't warrant any attack".
A boxing enthusiast who dons his gloves to work off the stress of the job in his rare free time, the Canadian prime minister will have to carefully measure his punches against the USA leader, who publicly accused him of weakness and dishonesty after the meeting of the G7 nations in Quebec at the weekend.
President of the European Council Donald Tusk said that "There is a special place in heaven for Justin Trudeau". Instead, he emphasized the need for other countries to reduce their barriers against the United States, such as Canadian duties on USA dairy.
"Trudeau chose to attack the president. Our Tariffs are in response to his of 270% on dairy!", Trump wrote in a second tweet.
Peter Navarro, Trump's top trade adviser, denounced Trudeau with language rarely used even against America's adversaries.
If these goods that originate in Canada and are eventually sold there without have been substantially worked upon in the United States are taken into account then Ottawa comes out the victor.
The President ripped Trudeau on twitter over his "false statements" to the press; adding that he instructed his administration "not to endorse" a joint statement from the G7 countries following the contentious summit.
Despite his own U.S. Trade Representative's office confirming the trade surplus falls more than $8 billion in Washington's favor, Trump has repeatedly insisted that U.S. workers are getting ripped off by NAFTA.