 This theory, which is sometimes presented as an incontestable doctrine... is founded on the belief that Muhammad ... came to Medina fully expecting the Jews to confirm his identity as a prophet ... To his surprise, however the Jews not only rejected him but strenuously argued against the authenticity of the Qur’an as divine revelation.Worried that the rejection of the Jews would somehow discredit his prophetic claims, Muhammad had not choice but to turn violently against them, separate his community from theirs, 

Aslan believes this theory is refuted by historical evidence