What could go wrong?

Mr. Huckabee will tape the interview with Mr. Romney on Friday, and it will be broadcast on his Fox News show, which airs on Saturday and Sunday evenings at 8 p.m. Eastern Standard Time. Promos for the interview are set to broadcast Thursday afternoon on the network.

The men have had a tense relationship since 2008, when a surprise victory in the Iowa caucuses by Mr. Huckabee, a former governor of Arkansas, upended a carefully designed plan by Mr. Romney, a former governor of Massachusetts, to win the state that year.