President Donald Trump faced a quick condemnation after questioning whether the NATO alliance would come to America’s aid during a time of need, even though the only time the alliance’s vital Article 5 was ever invoked was in the aftermath of the 9/11 terrorist attacks.

“I’ve always said, ‘Will they be there, if we ever needed them?’ And that’s really the ultimate test,” Trump said Thursday in an interview with Fox Business Network in Davos, Switzerland. “And I’m not sure of that. I know that we would have been there, or we would be there, but will they be there?”