Hours after leaving the G7 summit on Saturday, Trump took to Twitter to assault the Canadian Prime Minister Justin Trudeau's "false statements" and instructed USA representatives to renege on the US' endorsement of the joint communique.
He also said that Trump's public expression is a reiteration of his point of view, and that "we should not be surprised to see that".
Speaking in a solo press conference from the resort town of La Malbaie in Quebec, the president said that for too long, US trade has suffered from "bad" trade deals agreed to by past USA presidents.
Trump revealed that the US team had worked "very well" with the representatives from Pyongyang during the bilateral preparatory talks for the summit.
The president is flying to Singapore to meet with North Korea's Kim Jong Un.
"There's a special place in hell for any foreign leader that engages in bad faith diplomacy with President Donald J. Trump".
"He was even willing to sign that socialist communique", Navarro said, referring to the joint statement of G7 nations that Trump ultimately refused to sign, and which was reportedly the result of hard-line American demands.
Kudlow says the White House has taken issue with Trudeau's comments during the news conference that Canada must stand up for itself and that recently imposed USA tariffs on steel and aluminum are "insulting".
He wrote on his Twitter profile: "Please tell Prime Minister Trudeau and President Macron that they are charging the United States massive tariffs and create non-monetary barriers". That was a part of Trudeau's mistake.
White House economic adviser Larry Kudlow and Canadian Prime Minister Justin Trudeau.
"In terms of the approach that governments choose to take, Canada does not believe that ad-hominem attacks are a particularly appropriate or useful way to conduct our relations with other countries", she said.
"We are not going to live with the deals the way they are", Trump said.
At issue are US tariffs against Canada and Trudeau's effort to retaliate against its neighbor - as well as Trudeau's comment to reporters that all seven leaders had come together to sign a joint declaration after the G-7 meeting.
He blamed past world leaders, including past presidents, for that situation, but said the current crew - including Prime Minister Justin Trudeau - now know that the "gig is up".
Germany also said it will stand by the jointly agreed communique. Trump said as he departed the White House for the summit in Quebec. He described all seven leaders coming together to sign the joint declaration despite having "some strong, firm conversations on trade, and specifically on American tariffs". The United States pays enormous tariffs on dairy.
On Friday, European Council President Donald Tusk said Trump's criticism of the global rules-based order is "playing into the hands of those who seek a new post-West order where liberal democracy and fundamental freedoms would cease to exist".