When asked by Fox News host Tucker Carlson why America should have to defend the country, Trump again cast doubt on the core tenet of NATO, the mutual defense of all member nations.

I understand what you’re saying. I’ve asked the same question. Montenegro is a tiny country with very strong people. They’re very aggressive people. They may get aggressive, and congratulations, you’re in World War Three.

Montenegro is a Balkan nation of 630,000 people, and has been a NATO ally since 2017, officially joining during Trump’s presidency. Russia has behaved aggressively towards Montenegro, as it has with other neighbors, waging propaganda campaigns in the lead up to its joining NATO.

Trump infamously pushed the prime minister of Montenegro during a 2017 NATO summit.

Politico – Everything You Wanted to Know About Montenegro But Were Afraid to Ask
NBC News – Trump calls out ‘very aggressive’ Montenegro in latest NATO jibe
The New York Times – Montenegro: What to Know About the Tiny NATO Ally Trump Slighted
Wikipedia – Montenegro