Appearing Sunday on CBS' Face the Nation, Family Research Council (FRC) President Tony Perkins denied he called for the impeachment of Supreme Court justices who side with plaintiffs in a case challenging gay marriage bans in four states.

Justices will hear arguments in the case on Tuesday, with a ruling expected in June.

Host Bob Schieffer welcomed Perkins to the show by asking him if his group had taken their opposition to marriage equality “too far.”

“Mr. Perkins, I'm going to say this to you upfront. You and your group have been so strong in coming out against this and against gay marriage that the Southern Poverty Law Center has branded the Family Research Council an anti-gay hate group,” Schieffer said. “We have been inundated by people who say we should not even let you appear, because in their view 'you don't speak for Christians.' Do you think you have taken this too far?”

Perkins answered “no” and went on to defend saying that allowing gay couples to marry nationwide would lead to an “open season on people of faith.”

“This is what's at stake here, Bob. This is not about the marriage altar. This is about fundamentally altering the culture,” he said.

When asked if he called for the impeachment of Supreme Court justices who rule against state marriage bans, Perkins answered: “No. I didn't say that.”

But on Thursday, Perkins agreed with radio host Jan Mickelson when he called on Congress to “remove” the high court's “jurisdiction” over the marriage issue and “nullify” its decision, which would warn justices “if you try it again, we will impeach your sorry keisters.”

“I think you're absolutely right,” Perkins told Mickelson.

“I didn't say anything about impeachment of the judges,” Perkins said Sunday. “What I said, they're not the final say on this issue.”