Ayaan Hirsi Ali has become a polarizing figure on the international stage. On one side, she has championed the rights of Muslim women and Western values; on the other, she has been vilified by liberal critics for her attacks on Islam. Hirsi Ali takes her critiques of Islam further with her new book 'Heretic: Why Islam Needs a Reformation Now.' In it, she explains how the religion is divided and what tenets of the Muslim faith need to change in order to find peace and co-existence with the West.