WikiLeaks website, founded by Julian Assange in 2006, has published an e-mail received by John Podesta, the chairman of Mrs Clinton's presidential campaign, from Edgar D Mitchell, one of the Apollo 14 astronauts and the sixth man to walk on the moon, in August last year. The e-mail, in which Mr Mitchell and Mr Podesta appear to be on first name terms, reveals the pair were intending to have a conversation via Skype, apparently about the potential for war breaking out in space. Mr Mitchell warned his acquaintance that ETI (extraterrestrial intelligence) would "not tolerate any forms of military violence on Earth or in space". However, despite their apparent intolerance, he described the ETI as nonviolent.

GETTY Leaked Hillary Clinton e-mails have revealed top level discussions on aliens

WIKILEAKS The e-mail published by Wikileaks show a discussion on space wars and UFOs

We're arguably closer than ever to war in space The leaked e-mail to John Podesta

Mr Mitchell, who worked on the Treaty on the Prevention of the Placement of Weapons in Outer Space, wrote: "We're arguably closer than ever to war in space. Most satellites orbiting Earth belong to the US, China and Russia. And recent tests of anti-satellite weapons don't exactly ease the scare factor. "It sounds like science fiction, but the potential for real-life star wars is real enough." He included links in the e-mail to several online articles on the possibility of war in space pooled from various sources. Mr Mitchell said Deputy Defense Secretary Robert O Work spoke to Congress about space war last summer and President Barack Obama requested $5billion for space defence in the 2016.

GETTY The crew of Apollo 14 with Edgar D. Mitchell, who wrote the e-mail, on the right-hand side

He said: "Take a moment to think about everything satellites do. GPS, surveillance and communications all depend on them. And the Scientific American notes you can disable satellites without missiles. Simply spray-painting lenses or breaking antennas is enough." This is not the first time Mrs Clinton has been linked to UFOs and extraterrestrials. She has vowed to open America's top secret X-Files, containing details about UFOs and military base Area 51 in the Nevada desert if she becomes president in November.

GETTY Hillary Clinton has pledged to declassify US secret documents on aliens

Earlier this year she was a guest on radio show Power 105.1 Breakfast Club in New York where she met host Lenard McKelvey - also known as Charlamagne the God - who believes he has been abducted by aliens several times. She told Mr McKelvey she would open tyne files unless it posed a threat to national security. When asked whether she believed in aliens, Mrs Clinton replied: "I don’t know. I want to see what the information shows.

De-classified secrets of Area 51 Thu, March 16, 2017 The United States Air Force facility, known as Area 51 is a remote area in Nevada. Current purpose of the base is unknown, however conspiracy theorists and media have speculated purposes from UFO spacecraft research to analysing the brain activity of an alien. Play slideshow UIG via Getty Images 1 of 10 Conspiracy theorists believed remains of UFO spacecrafts were stored at Area 51, and that government scientists were researching the remains to engineer the aliens technology