In recent weeks, allies of Huckabee — himself a pastor and social conservative — have unleashed more than a million dollars in attack ads on Cruz, and specifically on whether he’s really committed to the evangelical cause and upholding its values.

Key figures in Iowa who now back Cruz aren’t pleased at all about the attacks.

“It’s disappointing,” Family Leader CEO Bob Vander Plaats, a key Iowa endorser for Cruz, told BuzzFeed News in an interview on Thursday. “And I love Gov. Huckabee as much as if not more than anybody. But it’s disappointing, especially coming from a campaign that’s associated with a pastor, to be questioning somebody’s sincerity in their faith.”

Vander Plaats endorsed Huckabee in 2008 when he won the Iowa caucuses.

For someone to say Cruz is a “faux conservative or a faux Christian, I just find that extremely disappointing on many levels. And it does no good for the body of Christ, it does no good for the Christian testimony for that to be taking place,” Vander Plaats said.