A 21-year-old man was arrested in Oxford yesterday morning on suspicion of rape and attempted rape.
It is believed he is history and politics student Ben Sullivan, president of the Oxford Union.
The alleged rape happened in January 2013, and the attempted rape was reported to have taken place in April 2013.
Mr Sullivan’s college, Christ Church, said: “We have unfortunately received information that a junior member of Christ Church has been arrested.”
Oxford University and Oxford Union refused to comment.
Thames Valley Police have confirmed he has been released on bail until June 18.