When Mr Trump's tweets withdrawing support from the G7 statement hit on Sunday, the Prime Minister's office said Mr Trudeau had not said anything in his closing news conference he has not said to the US President before.
With U.S. President Donald Trump and Prime Minister Justin Trudeau at the centre of the dispute, the back and forth has intensified since just before the start of the month - when the Americans imposed hefty steel and aluminum tariffs on Canada.
At a rare solo news conference before heading to Asia, Trump said he pressed for the G-7 countries to eliminate all tariffs, trade barriers and subsidies in their trading practices. In an in-depth interview with German broadcaster ARD, she said that the European Union would follow in the footsteps of Canada and come up with counter-measures to levy tariffs on the 28-member bloc. "Instead, we act then too". Her interview came about a day after Trump refused to endorse the G7 summit's communique that called for reducing tariff barriers.
Officially, the Trump administration used national security grounds to justify the tariffs, but Trump's clash with Canada may have more to do with a perceived personal slight than the facts of the bilateral relationship. "$800 Billion Trade Deficit", he said in another tweet.
But in an apparent nod to Trump, the G7 also pledged to push for swift reforms to the World Trade Organisation which the United States president has said has been a "disaster" for his country. Speaking on the condition of anonymity a Canadian official told national broadcaster CBC that not only had Trudeau made these remarks prior to the meeting, on US television last week, he had also informed Trump of his position before he went on air.
Speaking on "Fox News Sunday", Navarro doubled down on Kudlow's rhetoric and said Trudeau's post-conference comments were in bad faith.
Mexican Economy Minister Ildefonso Guajardo said on Monday the only way countries re-negotiating the North American Free Trade Agreement (NAFTA) will find a solution is through "sufficient flexibility" to narrow differences. Trudeau pulled a "sophomoric political stunt for domestic consumption" that amounted to "a betrayal", said Kudlow, who appeared on CNN's "State of the Union" and CBS' "Face the Nation".
"Canada does not conduct its diplomacy through ad hominem attacks ... and we refrain particularly from ad hominem attacks when it comes from a close ally", Ms Freeland told reporters in Quebec City.
More broadly, Trump officials have repeatedly said that the USA has the lowest trade barriers in the world to bolster their argument for imposing tariffs on other countries. From promoting democracy and to fighting terrorism, "we're on the same page". He also said the G7 countries had "again" failed to provide any evidence that Russian Federation was behind the poisoning of a former double agent and his daughter in Britain in March.