Fox News correspondent Peter Doocy brought up Obama's comments at the end of a press conference with South Korean President Moon Jae-in.
"What is true, and I'm actually being serious here, is that there are, there's footage and records of objects in the skies, that we don't know exactly what they are. We can't explain how they moved, their trajectory," Obama said on "The Late Late Show" earlier in the week. "They did not have an easily explainable pattern. And so, you know, I think that people still take seriously trying to investigate and figure out what that is."
Asked what he made of the flying objects, Biden laughed and said, "I would ask him again," before walking off the stage.
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