President Trump has questioned a key provision of the NATO military alliance—the mutual defense of NATO member countries. Trump made the remark during an interview with Fox News host Tucker Carlson.

Tucker Carlson: “Why should my son go to Montenegro to defend it from attack? Why is that”—

President Donald Trump: “I understand what you’re saying. I’ve asked the same question. You know, Montenegro is a tiny country with very strong people.”

Tucker Carlson: “Yeah, I’m not against Montenegro.”

President Donald Trump: “Right.”

Tucker Carlson: “Or Albania.”

President Donald Trump: “No, by the way, they’re very strong people. They have very aggressive people. They may get aggressive, and, congratulations, you’re in World War III.”