Republican presidential candidate Jeb Bush has said the United States should accept Syrian refugees if they’re Christian, but not if they’re Muslim.

But the former Florida governor on Tuesday was unable to explain how refugees would prove they were adherents of the Christian faith.

“At a minimum we ought to be bringing in people that have — orphans or people that clearly aren’t going to be terrorists. Or Christians,” Bush told reporters in South Carolina, according to ABC News. “There are no Christian terrorists in the Middle East, they’re persecuted.”

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One reporter questioned what his focus on Christian refugees would “actually look like.”

“Well, you’re a Christian, I mean, you can prove you’re a Christian,” Bush responded.

“How?” a reporter interjected.

“I think you can prove it,” Bush shrugged. “If you can’t prove it, you know, you err on the side of caution.”

The GOP candidate added that Christians in Islamic State-controlled territory were being persecuted, and that all refugees should be thoroughly vetted.

Watch video, courtesy of ABC News, below: