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Dr. James Mitchell, the man who personally interrogated 9/11 mastermind Khalid Sheikh Mohammed, said the avowed terrorist foretold of the dangers that could arise through lax immigration policy.

"[He] was warning of this very kind of thing ten years ago," Mitchell said, "[His] predictions are already coming to pass."

Mitchell said Mohammed told him that America's civil liberties and openness were "gifts from his god" and were the weaknesses and flaws necessary to carry out an infiltration of Sharia law throughout the West.

"Political correctness allows them to operate in our midst without being challenged," he said, 

"Like-minded Jihadi brothers would emigrate, wrap themselves in civil liberties for protection" and fund themselves through the welfare system, he said.

These trends, Mitchell said, could be reflected in terror attacks, like this week's attack in Berlin.

He said the best way to hinder terrorists' progress would be to "slow down immigration" from countries that support terrorism.

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