In the interview, extracts of which were broadcast on Radio 4's Today programme, he said he was questioned by a middle-aged man with a ponytail claiming to be "Jim from the FBI".
Jim reportedly said he was a special agent sent from Washington to ask questions on behalf of the White House.
Now the pony tail doesn't fit with any of the FBI Special Agents I have ever met - even the female ones. (US) Special Forces, wannabee "Military Contractors", possibly the CIA (although if I had ever met any of them I wouldn't be allowed to talk about it even if I knew) but not the FBI. They are the definition of "square" as it applies to dress and demeanour.