Independent presidential candidate Evan McMullin contradicted Donald Trump's claims that terrorists may try to embed themselves in the Middle East refugee population as a means of entering the U.S.

"I spent over 10 years in the CIA serving overseas — serving in the Middle East. And let me tell you, if you're a terrorist and you wanna come in the USA, the worst possible way to try to do it is as a refugee," McMullin said during an interview on Fox News' "Special Report" Monday night. "You'll go through a year and a half to two years of vetting."

The former House Republican Conference policy adviser said members of the Islamic State or any other terrorist group would be "much better off just coming through the Visa Waiver Program from Europe or just walking across the border in Mexico."

McMullin's comments came hours after the Republican nominee delivered a speech on national security in Youngstown, Ohio. Trump called for a ideological screening test to weed out sympathizers of terrorist groups. But McMullin said the public needs to halt its hysteria over concerns terrorists would sneak into the U.S. as refugees because it's not as much of a threat to Americans as Trump would have them believe.