Leave it to President Trump to start feuds at both borders; a feat so bizarre, Stephen Colbert devoted his Tuesday monologue to just that.

"We do not talk about international stories a lot on this show, but you see the news... it's a dangerous world, and every day, tensions are rising between United States and our sworn enemy: Canada," joked the "Late Show" host.

Colbert then went on to explain that President Trump had just announced a 20 percent tariff on Canadian-imported softwood lumber.

“Now, as far as I know, this is the first time anyone has rejected Justin Trudeau’s wood,” Colbert quipped. “He’s such a nice guy.... That’s the rumor."

Naturally, Canada's minister of natural resources, Jim Carr, fired back in a truly Canadian way:

"The government of Canada disagrees strongly with the U.S. Department of Commerce's decision to impose an unfair and punitive duty," read Colbert.

“Disagrees strongly... Them’s fighting words," concluded Colbert. "That’s Canadian for ‘F*ck you!’”

"Now," continued Colbert, "for those keeping score, Trump is now a friend of Putin and an enemy of Poutine."

And while accusing our northern neighbor of unfair trade practices is nothing new, as Colbert noted, "tensions have never been higher." 

Watch: