Dr. Ben Carson, a pediatric neurosurgeon at John Hopkins University and a conservative celebrity often mentioned as a possible GOP presidential candidate, on Thursday criticized pastors who support marriage equality.

Carson made his comments during an appearance on Family Talk radio, which is hosted by Dr. James Dobson, the founder of Focus on the Family who left the ministry in 2009.

“I find it difficult sometimes to understand why ministers are willing to abandon the scripture to go along and get along,” Carson said. “I just find that very puzzling.”

“I do too, especially the issue of gay marriage,” Dobson responded.

Allowing gay couples to marry, Dobson said, left out bisexual people, whom he described as having “sex with males and females at the same time.”

“I have been on a crusade to say to many ministers, and I’ll say it again now, that if men can marry and if the things that are said about same-sex relationships and marriage and the Bible are misunderstandings, what do you do with the rest of LGBT?” Dobson rhetorically asked. “What do you do with bisexuality? If one of those is right and proper and holy, what about those who have sex with males and females at the same time? That’s called orgies, that’s what it used to be called, or just sleeping around with everybody and it doesn’t matter. How can a Christian minister who reads the Bible condone that?”

Carson responded: “Well, you know, my emphasis is that marriage is an institution established by God himself. And when you look in the New Testament, the marriage relationship is used to help us understand His relationship with His people. So when you start distorting that, you’re really going pretty deep into the finger-in-your-eye to God. That’s why I have a hard time understanding why ministers are willing to do that.”