Astronaut Scott Kelly: Space Force 'I don't think is in our best interest'

(CNN) -- NASA Astronaut Scott Kelly has spent more time in space than any other human, and on Thursday said he didn't think a U.S. Space Force is a good plan.

NASA astronaut Scott Kelly aboard the International Space Station, Photo Date: March 28, 2015

Kelly — a 1996 graduate of the University of Tennessee Space Institute — made the remarks following Vice President Mike Pence's announcement about creating a U.S. Space Force by 2020.

"You know, my concern would be that we would potentially be encouraging other countries to do the same," Kelly said. "To have a military space race, I don't think is in our best interest.

"The capabilities that we're talking about are currently in the U.S. Air Force and ... you know, I just think that's sufficient."

Pence made the case for Space Force by saying the U.S. is under threat. The vice president said Russia, China, North Korea and Iran all want to "jam, blind and disable our navigation and communications satellites.

Defense Secretary James Mattis originally was not enthusiastic about the plans, but now he's on board with it.

Late night television hosts, though? Not so much.