Dr. Ben Carson, the retired neurosurgeon and Republican candidate for president, appeared on the Mark Levin Show Tuesday night, and sounded the alarm about the threat of domestic Islamist groups that pose as moderate organizations.

“Our political correctness is what is going to be our undoing,” Carson told the conservative radio host.

During the Holy Land Foundation trials, in 2007 and 2008, which was the largest terror financing case in U.S. history, a government-produced “explanatory memorandum helped get a handle on what the Muslim Brotherhood and some of these other organizations are doing, and CAIR in particular,” Carson explained.

“They said in that document that it would be particularly easy to carry out ‘civilization jihad’ in America because our people would be so silly and … protecting the rights of the very people who are trying to subvert our system, to their own expense,” the famed retired neurosurgeon added.

Levin remarked, “You’re the only candidate taking on this group CAIR, which is to me a very troubling front group for Hamas and some of these other outfits. And you’re the only one out there pounding away at them.”

CAIR has been declared a terrorist organization in the United Arab Emirates and was named by federal prosecutors as an unindicted co-conspirator in the foundation’s Hamas-funding operation.

Carson noted “the gravity of the situation and what the implications are for our country.”

Breitbart News has reported extensively on CAIR’s ties to radicalism.

An FBI chart that surfaced in December thanks to a Freedom of Information Act (FOIA) request depicted CAIR as a Hamas-related organization.

Frank Gaffney, the president and founder of the Center for Security Policy, said Carson made one the “most important” statements of the election cycle, for drawing attention to the issue at hand.

“Dr. Ben Carson has just made one of the most important statements of the 2016 presidential campaign. In an interview with Mark Levin last night, the GOP candidate called attention to a document known as “the Explanatory Memorandum” and observed that it lays out the Muslim Brotherhood secret plan for taking down our country,” Gaffney tells Breitbart News.

“Specifically, this Memorandum declares the Brotherhood’s mission in North America is “destroying Western civilization from within” and describes how this ambitious goal is being pursued through a variety of stealthy techniques,” he added.

Carson should be far from the only candidate speaking about this ever-important issue, the Center For Security Policy President said.

“Every other candidate to be our next Commander-in-Chief and every voter contemplating which one to hire for that job needs to acquaint themselves with this ominous plan, and learn how it has been successfully implemented over the past twenty-five years,” Gaffney concluded.