In what follows, however, I shall refer to “political Islam” rather than radical Islam. Political Islam is not just a religion as most Western citizens recognize the term “religion,” a faith; it is also a political ideology, a legal order, and in many ways also a military doctrine associated with the campaigns of the Prophet Muhammad. Political Islam rejects any kind of distinction between religion and politics, mosque and state. Political Islam even rejects the modern state in favor of a caliphate. My central argument is that political Islam implies a constitutional order fundamentally incompatible with the US Constitution and with the “constitution of liberty” that is the foundation of the American way of life.