Ted Cruz and Rick Santorum are slated to appear at a September “American Heritage Summit” in Washington, D.C., hosted by a right-wing Iowa pastor Cary Gordon of Cornerstone World Outreach.

Along with Gordon and the pair of likely presidential candidates, the guests include conservative pseudo-historian David Barton, Iowa-based talk show host Steve Deace and Iowa Republican Rep. Steve King.

Gordon became heavily involved in politics during the 2010 campaign to remove Iowa Supreme Court Justices who ruled in favor of marriage equality, and he endorsed Santorum’s 2012 presidential campaign, helping the former Pennsylvania senator to win the Iowa caucuses.

At an anti-gay marriage rally in 2011, Gordon described marriage equality as a demonic attempt that would bring about America’s destruction, warning that Iowans must “protect the virtue of true Americanism from our own mental barbarians who attack our minds with the God-hating secularism of Europe” or risk being “extinguished from the earth.”

Gordon even predicted that gay marriage would increase the murder rate: “The natural problem that causes is an overt immorality. The crime rates go up, people suffer, people are stealing and murdering and [doing] all the things morality tells you not to do.”

The pastor, insisting that it is a “glaringly obvious fact that being ‘gay’ is a behavior, and has nothing to do with civil rights,” charged in a 2010 blog post that the same-sex marriage ruling put Iowa on the road to Nazism: “True pastors, in the fashion of Christ, will not and cannot bow before the arrogance of Caesar and Herod. We have learned from our past mistakes. We will not repeat the mistake made by Lutheran pastors when confronted with German fascism.”

“[T]o the intelligent religious man, homosexuality will always be un-natural for a myriad of obvious reasons one shouldn’t have to explain,” Gordon wrote. “To the intelligent evolutionist, it will NEVER agree with the doctrine of ‘survival of the fittest.’”

Gordon’s church also released a video asserting that same-sex marriage would legalize incest, pedophilia and bestiality.