Oxford students have launched a campaign to force the Oxford Union's president to resign after he was accused of rape and attempted rape.

The Oxford University Student Union’s Vice President for Women, Sarah Pine, and second year history and politics student Helena Dollimore are asking high-profile speakers to withdraw from Union debates.

Two weeks ago, the Union's current president, Ben Sullivan, was called in by police for questioning on allegations of rape and attempted rape. He has been released without charge on bail, and returned last week to his position. He denies the allegations, and made this statement to the debate chamber:

“As you may be aware no charges have been brought against me and I have the utmost faith in the police and Crown Prosecution Service and the British legal system as a whole. I know that sooner or later the truth will prevail and justice will be served.”

Pine and Dollimore have so far contacted about 30 of the upcoming speakers, explaining the situation and asking them to pull out of their appointments at the Union. They include Human Rights Watch’s David Mepham (who has agreed to pull out), band Foster the People, American entrepreneur Julie Meyer, Newton Investment CEO Helena Morrissey, MEP and former Belgian prime minister Guy Verhofstadt, actor Evanna Lynch, Baroness Lawrence, singer Paloma Faith, and New Statesman editor Jason Cowley.

Pine, who is campaigning in a personal capacity, calls it a “push for equality in the Union”. She decided to contact most of the Union’s booked speakers because they “wouldn’t have been aware of the situation and might not have been aware of the students’ feelings around it”. However, she admits that “there are differences in opinion” about whether or not Sullivan should resign.

Oxford student Helena Dollimore, who is campaigning jointly with Pine, said that she believes high-profile speakers should reconsider their commitment to the Union. “Ordinary students are just getting quite fed up at the Oxford Union and the press it’s generating, the reputation it’s generating, the message it’s sending out about our university.”

A vote of no-confidence in the president has been called for this Thursday by an ordinary Union member, but I am told that even if this passes, it does not automatically mean Sullivan will resign.

The open letter has been signed by New Statesman columnist Laurie Penny and feminist campaigner Caroline Criado-Perez.

UPDATE: Under Oxford Union rules, a member can only be suspended if criminal charges have been brought, in which case the Standing Committee can take action. See p16 of the Oxford Union rules for further details.

UPDATE, 18 JUNE 2014: Thames Valley Police confirm that the case against Sullivan has been dropped and he will not face charges.