One of the interrogators of Khalid Sheikh Mohammad, the mastermind of the 9/11 attack, stated on Fox News' The Kelly File Wednesday that political correctness "started that chain" that led to Monday night's Berlin truck attack, according to Fox News.

Dr. James Mitchell told guest host Sandra Smith that "[It] was political correctness and their unwillingness to get this person out of their country who had no business being there because he didn’t have the right paperwork to prove who he was," referring to the suspect in the attack on a Christmas market which killed 12 people and injured 48 more.

Mitchell said that he and Mohammed, commonly known as KSM, had discussed "lone-wolf"-style attacks more than a decade ago. Mitchell noted that Mohammed had been particularly struck by the effectiveness of the 2002 D.C. sniper attacks:

"What surprised him was how much paralysis it caused given how few deaths were involved, few from his perspective. And what he said to me was our civil liberties and our openness and our willingness to be responsive to other peoples’ cultures... were weaknesses and flaws that his God, Allah, had put into the American culture so that we could be defeated."

Mitchell said Mohammed believed the easiest way to win "the long battle to take over the world with Sharia law" was through "through immigration and by outbreeding non-Muslims":

"He said that like-minded jihadi brothers would immigrate to Western democracies and to the United States, they would wrap themselves in our civil liberties for protection, they would support themselves in our welfare systems while they spread their jihadi message, and then, when the time was right, they would rise up and attack."

Mitchell called for the U.S. to restrict immigration from countries that promote terrorism, echoing President-elect Donald Trump's campaign promise.

"I hope there’s gonna be change," Mitchell said of Trump's election victory, "because here’s the way political correctness works for a guy like Khalid Sheikh Mohammed: it allows them to operate in our midst without being challenged."