Liberty University’s Matt Barber took anti-gay activists’ vow to disobey a Supreme Court ruling for marriage equality to its extreme yesterday, telling Iowa radio host Steve Deace that if the court strikes down bans on same-sex marriage, it will “no longer be legitimate” as a court.

Saying that such a ruling would be the “Dred Scott of marriage,” Barber told Deace that if the justices “presume to redefine the institution of marriage, thereby destroying the institution of natural marriage, this Supreme Court will no longer be legitimate.”

Barber said that there “would be no rationale” for such a decision. “There’s no constitutional rationale,” he said, “there’s no historical rationale, there’s no biological rationale, there simply is no rationale other than that they want it so very badly, ‘they’ being homosexual activists and other cultural Marxists, leftists, people who are seeking to undermine the institution of natural marriage and ultimately God’s design for human sexuality.”

When Deace asked him what would happen if the Supreme Court were to side with anti-gay activists on the marriage issue, Barber echoed his colleague Mat Staver in saying that the movement would have to then get to work making sure that gays and lesbians can no longer get married anywhere in the U.S.

First, he said, the movement would have to work to repeal state-level judicial decisions instituting marriage equality, “and then work from there to make sure that marriage is not redefined in any of our 50 states here and to undo the damage that has already been done.”