The US President gave a press conference at the seat of the summit in the Canadian town of La Malbaie shortly before he left the meeting to head for Singapore, where on June 12 he will meet with North Korean leader Kim Jong-un, Efe reported.
Kudlow, in a separate TV appearance, said Trudeau was "polarizing" and "really kind of stabbed us in the back".
Foreign Affairs Minister Chrystia Freeland followed, with a bit of Latin in her response: she said "ad-hominem" attacks weren't useful.
President Trump concluded his visit to the Group of Seven summit on Saturdaywith warnings to US allies, saying if they don't eliminate barriers to trade, they could lose access to the USA economy.
"I've been called worse things by better people", said the elder Trudeau. Trump has pointed to Canadian Prime Minister Justin Trudeau's criticism of him as a reason for withdrawing from the consensus statement. "And that's what bad faith Justin Trudeau did with that stunt press conference". Can't do it in person.
Donald Trump and Justin Trudeau have been at loggerheads over trade tariffs
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".
He told reporters that imposing retaliatory measures "is not something I relish doing" but that he wouldn't hesitate to do so because "I will always protect Canadian workers and Canadian interests".
President Donald Trump's trade adviser says: "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". He had other things, bigger things, on his plate in Singapore.
Trudeau said the communique has "strong commitments about the actions we are going to take".
The statement made no mention of Russian Federation being invited back into the group from which it was kicked out of in response to its 2014 annexation of Crimea despite Trump's insistence that the club would be better off if brought Russian Federation back into the fold. "That will not stand". From promoting democracy and to fighting terrorism, "we're on the same page".
"To our allies: bipartisan majorities of Americans remain pro-free trade, pro-globalization & supportive of alliances based on 70 years of shared values", McCain tweeted.
Trudeau had said Canadians "are polite, we're reasonable, but also we will not be pushed around".
A few hours earlier, Trudeau had told reporters that all seven leaders had come together to sign the joint declaration.
Trump said on Twitter that he would not sign the communique, calling Trudeau "very dishonest & weak" for his trade criticism. He says that we are the problem with tariffs.
But when Trudeau said Canada would be forced to retaliate for USA tariffs on steel and aluminum and would not agree to a sunset provision in a new North American Free Trade Agreement, "he really kind of stabbed us in the back", Kudlow said. "I would say the relationship is a 10", Trump said.
All of his answers tracked with what he's said in the past, but they set Trump off.
The annual G-7 summit appeared to have weathered tensions over President Donald Trump's threats of a trade war.
Like Navarro and Kudlow, Sen.