WATCH: Stephen Colbert’s most biting bit yet

This is probably one of Stephen Colbert’s most brilliant, biting bits yet.

On The Late Show, Colbert mocked Republicans who are refusing to allow Syrians to seek refuge in the U.S. from their nation’s brutal civil war.

Two GOP candidates, Jeb Bush and Ted Cruz, have suggested limiting refugees to Christians only, saying that “there is no meaningful risk of Christians committing acts of terror.”

“That’s right, Christians have never committed acts of terror,” Colbert said, showing a photo of KKK members rallying around a burning cross. “I’m sure these guys right here are just campers roasting marshmallows. You can tell they’re campers because they’re each wearing one-man tents.”

Bush said refugees should be able to prove they’re Christians, but he simply shrugged and repeated himself when asked exactly how they would do that, prompting Colbert’s most biting comment yet:

“If you want to know if somebody is Christian, just ask them to complete this sentence,” Colbert said, quoting from Matthew 25:35. “Jesus said I was hungry, and you gave me something to eat. I was thirsty, and you gave me something to drink. I was a stranger and you — and if they don’t say welcomed me in, they are either a terrorist or they are running for president.”