Dr. Ben Carson was on “The O’Reilly Factor” tonight with a warning.

Carson said that ISIS terrorists have strong convictions and are willing to die for their beliefs.

“We at the same time are in the process of giving away all our beliefs for the sake of political correctness. And I’m saying that as a warning. We have to change that," he said.

O’Reilly asked Carson to name a core value that Americans are giving away because of political correctness.

“Honesty,” Carson said. “People are afraid to express what they actually believe because they’re afraid that they’re going to be ostracized or called a name.”

Watch more above.