A government file on Barack Obama Sr. said that Harvard University, where he was studying, told immigration officials it would “cook something up” to force him to return to Kenya in 1964.
The immigration file, which was released under freedom of information laws, contains records of Mr Obama Sr.’s time as a student at the universities of Hawaii and Harvard between 1959 and 1964.
It may solve the long-running mystery, described in the President’s memoir, of why his father really left the US, only returning to see his son once before he died.
An April 1961 memo said that a University of Hawaii employee called to report that Mr Obama Sr. had married Ann Dunham, the future president’s mother.
She warned that he was already married to a woman in Kenya and had been “running around with several girls” since arriving and that he had been warned to curb his “playboy ways”