White House Trade Adviser Peter Navarro apologized on Tuesday for saying Canadian Prime Minister Justin Trudeau has a “special place in hell” after Trudeau butted heads with President Donald Trump over trade restrictions at a G-7 summit over the weekend.

Navarro offered the apology at a Wall Street Journal conference in Washington, saying:

“That was my mistake. Those were my words,” Navarro added.

Navarro's initial remarks came during an interview on Fox News Sunday after the G-7 economic summit in Quebec.

“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 said in response to Trudeau's tough rhetoric criticizing U.S. tariffs.

Trudeau sparked tensions with Trump and U.S. officials when he asserted that he wouldn't let the U.S. bully Canada on trade.

Trump lashed out against Trudeau on Twitter, doubling down on tariffs recently placed on Canadian imports and slamming what he sees as an unequal trading relationship between the two countries.

For their part, the Canadian parliament rejected “disparaging ad hominem statements by U.S. officials which do a disservice to bilateral relations.”