A Christian-based legal group is attempting to force California Governor Arnold Schwarzenegger and Attorney General Jerry Brown to appeal a federal district court ruling that found the state's gay marriage ban, Proposition 8, unconstitutional, the AP reported.

The Pacific Justice Institute filed its case Monday in the Third District Court of Appeals in Sacramento.

Proposition 8, which was narrowly approved by voters in November 2008, put an end to the gay weddings taking place in California after the state's Supreme Court legalized the institution.

Last month, Chief U.S. District Judge Vaughn Walker ruled the law violated the U.S. Constitution.

The lawsuit named the state of California – represented by Schwarzenegger and Brown – as defendants. But both officials have refused to defend the law.

Proposition 8's sponsor, Protect Marriage, a coalition of social conservative groups that includes the Church of Jesus Christ of Latter-day Saints (the Mormons), the California Catholic Conference and various evangelical churches, intervened to defend the law.

But doubts have been raised about whether the group has standing to appeal Walker's ruling.

“While the court determined that proponents had a significant protectible interest … in defending Proposition 8, that interest may well be 'plainly insufficient to confer standing,'” Walker wrote in his ruling.

The Ninth Circuit Court of Appeals in San Francisco has put the ruling on hold and scheduled oral arguments for the second week in December.

The lawsuit argues that state officials do not have discretion to pick and choose which laws they wish to defend.

The state has until September 11 to file an appeal.