In a new interview, retired NASA astronaut and current Arizona senator Mark Kelly insisted that the US government could be doing much more to investigate credible claims about unidentified flying objects.

Speaking to GZero founder Ian Bremmer, the former twin astronaut didn't scoff at the idea that the truth may be out there.

"I've seen some compelling testimony from navy fighter pilots who... in a position of leadership in a squadron, have seen something very compelling," Kelly said.

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