"It's the worst public Oval Office meeting that I have ever witnessed," says Max Bergmann, director of the Europe, Russia and Eurasia program at the Washington-based Center for Strategic and International Studies. He calls it a "dark day for the transatlantic alliance" and says it puts the "future of the NATO alliance in doubt," as Donald Trump and JD Vance "decided to play the role of [a] bully." SOUNDBITES