BILL Clinton admitted he sent agents to Area 51 as he wanted to know if there were aliens on the base.
The former United States president also revealed scientists told him they are up to 95 percent sure humanity is not alone in the universe.
Bill Clinton, 75, was speaking about the traditionally fringe topic on The Late Late Show as discussions around UFOs take center stage in Washington DC.
Strange phenomena in the sky were once the realm of conspiracy theorists, but now US lawmakers and intelligence officials are taking the topic seriously as a national security concern.
US officials have admitted there are objects in the sky which they do not understand - which are now more commonly called Unidentified Aerial Phenomenon (UAP).
When Late Late Show bandleader Reggie Watts asked about the topic, the audience laughed, only for Bill to turn to them and say: "That's a legitimate question now."
Clinton - who held the big job in the White House from 1993 to 2001 - revealed he and National Security Adviser Sandy Berger were interested in UFOs.
"We made every attempt to find out about Roswell and we also sent people to Area 51 to make sure there were no aliens," he said.
Clinton was interrupted by James Corden, who asked who he sent to Area 51, and then joked: "Oh, if I told you that."
The veteran Democrat continued and revealed Berger was dispatched to Area 51.
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Clinton said the notorious base in Nevada, which is subject to countless urban legends and pieces of modern folklore, is where many US secret projects regarding military aircraft are developed.
"That is why they are so secretive," he said.
He then went on to tell a story about a visit he and his wife Hillary made to the WM Keck Observatory in Hawaii.
The double telescopes - Keck 1 and Keck 2 - are two of the biggest in the world and search the skies for any sign of life in outer space.
Clinton toured the facility and asked the scientists about the possibility of extraterrestrials out there somewhere in the universe.
He said the scientists said they had "huge arguments" - but the dispute is between those who believe it is "85 percent" likely, and those who think it is "95 percent" sure.
They told him it's "very unlikely" that there is no life somewhere else in the massive universe other than on Earth.
"These are people who spend their lives doing this," Bill told Corden.
Clinton is just one of many high-profile names, including former US President Barack Obama and NASA Chief Bill Nelson who have encouraged people to take seriously talk of aliens and UFOs.
NASA just last week announced they were launching their own probe into UAPs, while Russia's own space agency Roscomos also confirmed they are also running an investigation.
US lawmakers last month grilled intelligence chiefs about the encounters as they confessed over the last year they have probed 400 sightings and 11 near misses.
It was the first hearing of its kind in 20 years.
The intelligence bosses attempted to explain how difficult it is to track these objects, and showed congressmen two videos.
And while they did not mention aliens, they did admit there are some of the 400 encounters they have in their books which are truly unexplained.
It came off the back of a landmark Pentagon report in 2021 following the leaking of three videos showing US Navy encounters with unexplained objects.
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Many servicemen are now coming forward to tell stories of mysterious encounters with objects they say do not move like any known plane or drone.
While it's unclear what the phenomena actually is, it appears there is definitely something in the skies which currently cannot be explained.