"I have not been watching that myself, but my wife did say that ticket sales were up yesterday," Denney said, adding that "the Christian community has rallied around Phil."
Denney said he has no objection to Robertson's comments.
"Under the First Amendment he has the right to say what he wants and under the First Amendment he also has freedom of religion," said Denney. "One of the reasons that we invited him to come to Idaho is because he reflects our values as well."
"They do reflect my Christian values," Denney said of Robertson's comments about gays and non-Christians.
Denney also addressed Robertson's statements that African Americans "were happy" in the South during the Jim Crow era.
"Being from Idaho, we really didn't know any of that and I can't really speak on what happened in the South back when Phil was growing up," he explained.
Denney is a Republican who previously served as speaker of the house in the Idaho Legislature. He said his daughter lives in Louisiana and is friends with Robertson's family.
Robertson will be joined by his wife, son, and daughter-in-law at the event, which is being billed as "An Evening With Duck Dynasty." According to Denney's website the Robertsons will "speak on their family values and America’s Heritage" at the event.