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 coexistence with the West.