Several U.S. and foreign leaders on Sunday leapt to the defense of Canadian Prime Minister Justin Trudeau after he was assailed on Sunday morning talk shows by two of President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's top advisers.

Both White House economic adviser Larry Kudlow and Trump's top trade adviser, Peter Navarro, blasted the Canadian leader, sparking criticism from leaders at home and abroad. Politicians focused in particular on comments from Navarro, who laid into Trudeau on "Fox News Sunday" for his pledge to implement retaliatory tariffs on the U.S.

"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," Navarro said.

ADVERTISEMENT

"That was one of the worst political miscalculations of a Canadian leader in modern Canadian history," he added.

Trudeau has not directly addressed Navarro's comments, but Canada's foreign minister, Chrystia Freeland, said the remarks were not "particularly appropriate or useful."

"Canada does not believe that ad hominem attacks are a particularly appropriate or useful way to conduct our relations with other countries,” Freeland said at a press conference Sunday.

Navarro was referencing a news conference held after Trump had departed the Group of Seven (G-7) summit ahead of schedule. In the conference, Trudeau said it was "kind of insulting" that the U.S. implemented steel and aluminum tariffs against Canada on the basis of national security. He pledged to impose retaliatory tariffs against the U.S., adding Canada "will not be pushed around."

Trudeau's comments drew the ire of Trump, who called Trudeau "dishonest & weak" and declined to sign onto a joint statement issued by G-7 attendees at the conclusion of the weekend's summit.

On Sunday morning, Navarro and White House economic adviser Larry Kudlow torched Trudeau, underscoring a growing rift between the U.S. and one of its closest allies over trade policy.

In response, U.S. and foreign officials, including multiple vocal critics of Trump, honed in on Navarro's remarks.

Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeHow fast population growth made Arizona a swing state Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden MORE (R-Ariz.), a frequent critic of the president, condemned Navarro's comments as a reflection on the GOP, saying "this is not who we are. This cannot be our party."

Fellow Republicans, this is not who we are. This cannot be our party. https://t.co/xkGMYfoR9w — Jeff Flake (@JeffFlake) June 10, 2018

Sen. Chris Murphy Christopher (Chris) Scott MurphyDemocratic senator calls for 'more flexible' medical supply chain to counter pandemics The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon GOP chairman to release interim report on Biden probe 'in about a week' MORE (D-Conn.) blasted the Trump administration, suggesting their attacks on Trudeau were based on a lie.

"Trudeau didn’t pick a fight. This is a lie just like all the others," Murphy tweeted. "Trump is making the United States a global laughingstock, drying up our credibility/influence so badly that the next President can’t get it back."

Trudeau didn’t pick a fight. This is a lie just like all the others. Trump is making the United States a global laughingstock, drying up our credibility/influence so badly that the next President can’t get it back. — Chris Murphy (@ChrisMurphyCT) June 10, 2018

Rep. Justin Amash Justin AmashInternal Democratic poll shows tight race in contest to replace Amash Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill On The Trail: How Nancy Pelosi could improbably become president MORE (R-Mich.) tweeted Sunday night that "Canadians are our brothers and sisters. Whatever our differences, let’s work them out as a family—with honesty and candor but also with love, respect, and humility."

Canadians are our brothers and sisters. Whatever our differences, let’s work them out as a family—with honesty and candor but also with love, respect, and humility. — Justin Amash (@justinamash) June 10, 2018

Susan Rice, a former national security adviser and United Nations ambassador for the Obama administration, suggested Navarro was looking to spark a war with Canada.

"So since Navarro has failed in his longstanding ambition to start a war with China, now he wants to start one with Canada?" Rice tweeted.

So since Navarro has failed in his longstanding ambition to start a war with China, now he wants to start one with Canada? https://t.co/oC0zaXWnBt — Susan Rice (@AmbassadorRice) June 10, 2018

Foreign leaders also took notice of Navarro's comments, and were quick to defend Trudeau.

European Council President Donald Tusk took a thinly veiled shot at the trade adviser, writing that there's a "special place in heaven" for Trudeau.

"There is a special place in heaven for @JustinTrudeau. Canada, thank you for the perfect organisation of G7!" Tusk tweeted.

There is a special place in heaven for @JustinTrudeau. Canada, thank you for the perfect organisation of G7! — Donald Tusk (@eucopresident) June 10, 2018

Like Canada, the European Union has also vowed retaliatory tariffs in response to Trump's trade policies.

Former Mexican President Vicente Fox, who has been an unabashed critic of Trump, offered support to Trudeau.

"We both neighbors and partners totally disagree with @POTUS he doesn't represent founding father's dream or the real values and believes of that great nation," he wrote.

Bravo PM Justin, we're with you.

We both neighbors and partners totally disagree with @POTUS he doesn't represent founding father's dream or the real values and believes of that great nation.

Dear American People, until when you will go by him, against the rest of the world? https://t.co/WAQqt10W5L — Vicente Fox Quesada (@VicenteFoxQue) June 10, 2018

Not all lawmakers disagreed with the White House in assigning blame to Trudeau. Among them was Rep. Raja Krishnamoorthi (D-Ill.), who warned that Trudeau was "sabotaging" trade negotiations between the U.S. and Canada.

"While I have serious concerns about President Trump’s approach to trade talks with Canada, Prime Minister Trudeau has placed our trade relationship with Canada at risk by publicly feuding with President Trump on the world stage," Krishnamoorthi said in a statement.

Updated: 9:07 p.m.