Brian Brown, president of the National Organization for Marriage (NOM), on Friday called for Supreme Court Justice Ruth Bader Ginsburg to recuse herself from an upcoming case challenging gay marriage bans in four states.

“Justice Ginsburg has brought disrepute on the Supreme Court and eliminated any pretext that she will approach the marriage issue with an open mind when it comes before her,” Brown said in a blog post. “Because of this prejudice, federal law requires her to remove herself from hearing the cases.”

In a Bloomberg Business interview Wednesday, Ginsburg said that Americans are prepared to accept a Supreme Court ruling striking down restrictive marriage bans.

“I think it would not take a large adjustment,” Ginsburg said.

“Justice Ginsburg has made it crystal clear that she is going to rule in favor of redefining marriage when these cases come before her,” Brown said. “We demand that she comply with federal law and disqualify herself as she is required to do. If she refuses, we will ask Congress to act.”

Brown, however, did not ask for conservative justices to step down. Justice Antonin Scalia has made his opposition clear. In 2013, Scalia told a group of lawyers that there is no right to “homosexual conduct” in the United States Constitution.