"I have made it very clear to the President that it is not something we relish doing, but it something that we absolutely will do", Trudeau said.
Speaking to ABC News, Republican Texas Senator Ted Cruz added his voice to the chorus of condemnation, saying: "You know, I will say I've seen some of the reporting on the various comments, and I have to note that I'm pretty sure that circles of hell are not reserved for Canadians proposing retaliatory tariffs". "He'll learn, he can't do that", Trump said.
Two points of the joint communique formulated by the G7 members were not negotiated with the USA president, but that didn't prevent the Canadian prime minister from announcing that all member-states had reached common ground on the final statement.
"Canadians, we're polite, we're reasonable, but we also will not be pushed around", he said.
"According to a Canada release, they make nearly 100 Billion Dollars in Trade with United States (guess they were bragging and got caught!)".
"I had a very good meeting with the G7", Trump said, rejecting suggestions the summit was a failure.
Navarro, the Trump trade adviser, said his harsh assessment of what "bad faith" Trudeau did with "that stunt press conference" on Saturday "comes right from Air Force One". The compromise on that issue resulted in language that said "free, fair, and mutually beneficial trade and investment, while creating reciprocal benefits, are key engines for growth and job creation".
President Donald Trump's trade tariffs on Canada are sparking retaliation. In a series of tweets, the United States president called him "very dishonest and weak" and accused him of making false statements.
Canada's foreign minister, Chrystia Freeland, said her country "does not conduct its diplomacy through ad hominem attacks".
Navarro wasn't the only Trump official to go after Trudeau.
Trudeau said he had reiterated to Trump, who left the G-7 meeting before it ended, that tariffs would harm industries and workers on both sides of the U.S.
The spat between Trudeau and the White House has underscored a growing rift between the two allies over trade policy.
On Tuesday Trump reiterated his belief that the United States is "being taken advantage of by virtually every one" of the countries in the G7.
Mr Trudeau and the European Union have vowed to take retaliatory action next month over U.S. tariffs on steel and aluminum. Minimum is 17B. Tax Dairy from us at 270%.
"Justin acts hurt when called out!" the US president said in his latest Tweet.