A book written by a CIA contractor said terrorists plan to use easy immigration laws and outbreeding Muslims to fill the U.S. with like-minded Muslims who would "violently impose Sharia from within" and destroy the country, the Washington Examiner reported.
The book, titled "Enhanced Interrogation: Inside the Minds and Motives of the Islamic Terrorists Trying to Destroy America," author James Mitchell interviewed incarcerated terrorists at Guantanamo Bay and learned that catastrophic attacks like 9/11 weren't seen as practical to the terrorists.
Khalid Sheikh Mohammed, the principal architect of the 9/11 attacks, told Mitchell that the "'practical' way to defeat America was through immigration and by outbreeding non-Muslims."
From a passage in Mitchell's book:
Mohammed "said jihadi-minded brothers would immigrate into the United States, taking advantage of the welfare system to support themselves while they spread their jihadi message. They will wrap themselves in America's rights and laws for protection, ratchet up acceptance of Sharia law, and then, only when they were strong enough, rise up and violently impose Sharia from within."