The media regularly reports about the danger to America from Islamic terrorists. But what about potential threats from inside this country?
Radical Muslims are looking for ways to bring sharia law to the United States.
Click play to hear more from Author Robert Spencer on the threats posed to America from within her borders.
Are Muslims in America victims of Islamophobia? Warnings from the Council on American-Islamic Relations seem to suggest just that.
CAIR claims to be the nation's leading Muslim civil rights group. But the group's critics say it's focused more on making Islam a dominant force than with fighting bigotry.
In a 1998, CAIR founder Omar Ahmad told the San Ramon Valley Herald, "Islam isn't in America to be equal to any other faith, but to become dominant. The Koran should be the highest authority in America, and Islam the only accepted religion on Earth."
Others point to a 1991 memo by the radical Muslim Brotherhood challenging American Islamic groups.
The memorandum, presented as evidence during a terrorism trial last year, reads that these Muslim groups "must understand that their work in America is a kind of grand jihad in eliminating and destroying the western civilization from within and 'sabotaging' its miserable house by their hands" until Islam reigns supreme."
For radical Muslims, that means pushing an aggressive, pro-Islam agenda that's been increasingly successful in recent years: Muslim cab drivers in Minneapolis refuse to carry passengers who have alcohol in their possession. Public schools schedule prayer breaks to accommodate Muslim students. Pork is banned in the workplace - the list goes on.
Islam expert Robert Spencer says Americans have caved in to such demands far too often. His new book, The Stealth Jihad, describes the non-violent war being waged by radical Muslims against American society.