Paul Hellyer, a former Canadian Minister of Defencem, said an unnamed former Canadian Chief of Emergency Measures revealed the astonishing story just before his death from a neurological illness.
Mr Hellyer, 92, revealed the claim to a panel of the world's top UFO and alien investigators and experts.
Speaking at the "Hearing on ET Disclosure” in Brantford, Ontario, Canada, Mr Hellyer explained that if he wanted to know about the workings of an alien space craft he would "ask the current chief of emergency measures".
Mr Hellyer, who became a UFO expert after claiming to have seen proof of alien visitations while in office, said: "The reason I know is I interviewed the previous one, who is now deceased, and he went Langley and the CIA asked if he would like to see one of these crafts.
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