Scandal hit Mr Clinton asked Webster Hubbell, his associate attorney general, to find out all he could about two of the world’s biggest conspiracy theories – that more people than Lee Harvey Oswald were involving in killing his predecessor John F Kennedy, and the US Government has covered up for years the fact that aliens have visited Earth.
According to his memoir Friends in High Places, Mr Hubbell hit a brick wall at every turn.
He was unable to find out anything more about the death of JFK.
Thousands of files made public by the CIA about the death late last year were not handed over.
And, while he was able to get the disclosure of some files on US interest in UFOs, there was no smoking gun evidence that aliens conspiracy theorists are seeking.
Mr Hubble concluded that a “secret government wing” holds all such data, that even the President is not privy to.
Mr Hubbell wrote that the two tasks given to him by Mr Clinton were to resolve the mysteries surrounding the murder of JFK and to get to the bottom of the understanding of the government on UFO sightings.
His conclusion of a secret government wing appears to tally with the claims of conspiracy theorists, like the Paradigm Research Group (PRG), which campaigns for alien disclosure that there are “unacknowledged special access projects” within the US government, that are not only top secret but not even admitted to.
However, Mr Hubbell was given some information on UFOs from the then CIA chief James Woolsey. Mr Woolsey revealed the agency had run two projects named ‘Project SIGN’ and ‘Project SAUCER’ to access whether if UFO sightings were a threat to national security.
The inquiries concluded there was no such threat.
In March 2016 Express.co.uk told how Bill and Hillary Clinton had long intrigued the UFO disclosure movement after making little publicised moves in the 1990s to bring about openness through secret meetings with late billionaire business tycoon Laurence Rockefeller, also an alien truth seeker.
It was understood the Rockefeller Initiative was unsuccessful, although neither of the Clintons have publicly spoken about it since.
Mr Hubble, who is the only member of camp Clinton to go public about the former president’s attempts said: “Mr Clinton was left disappointed by the lack of information on the subject they received.”
Mrs Clinton reignited the interest during her campaign for the White House in 2016, when she vowed to open up the UFO files if she got elected.
Her campaign manager John Podesta is also heavily involved and regularly tweets about the subject of disclosure.