Washington, March 8 -- U.S. President Donald Trump once again questioned the role of the North Atlantic Treaty Organization (NATO), casting doubt on whether other members of the military alliance would defend America if it were attacked.

"You know the biggest problem I have with NATO? ... I know the guys very well. They're friends of mine. But if the United States was in trouble, and we called them ... Do you think they're going to come and protect us? They're supposed to. I'm not so sure," Trump said Thursday in the Oval Office.

French President Emmanuel Macron responded to Trump's remarks by telling reporters at a European Union summit Thursday in Brussels that France and the United States have "always been there for each other" through...