Yet he said there could still be aliens out there somewhere.
"We know now we live in an ever expanding universe. We know that there are billions of star and planets literally out there, and the universe is getting bigger," he said. "We know from our fancy telescopes that just in the last two years, more than 20 planets have been identified outside our solar system that seem to be far enough away from their suns and dense enough that they might be able to support some form of life, so it makes it increasingly less likely that we are alone."
Kimmel asked Clinton if he was trying to say that there is in fact alien life.
"I'm trying to tell you I don't know, but if we're visited someday, I wouldn't be surprised. I just hope that it is not like 'Independence Day,'" Clinton responded.
The former President did say that he hoped that an alien invasion would at least bring an end to conflict on earth.
"That may be the only way to unite this incredibly divided world of ours," he said. "They are out there — we better think of how all the difference among people on earth would seem small if we felt threatened by a space invader. That is the whole theory of 'Independence Day.'"
Watch a clip via KTLA:
[H/t The Hill]