Top Republicans have joined the fight against gay marriage in the District of Columbia, the Washington Post reported.

Stand for Marriage DC is challenging a District of Columbia Board of Elections and Ethics ruling that blocked opponents from pursing a ballot initiative banning gay marriage in the District. The board concluded twice that such a measure would violate the city's Human Rights Act that prohibits discrimination based on sexual orientation.

Thirty-nine Republican legislators, including two senators, James M. Inhofe of Oklahoma and Roger Wicker of Mississippi, and 37 House members, have filed an amicus brief in support of gay marriage opponents.

A gay marriage law signed by Mayor Adrian M Fenty, a Democrat, is currently under review by Congress, which has final say on all laws approved by City Council. If Congress does not intervene, the law will go into effect in March.

“As members of the District's ultimate legislative body, amici are concerned about the extent of the District's delegated legislative authority, the preservation of Congress' constitutional authority, and the interpretation of home rule,” the brief says.

All of the GOP lawmakers are gay rights foes. With the exception of Michigan Representative Thaddeus McCotter, who supported a bill last year that would have outlawed discrimination based on sexual orientation in the workplace but is not a co-sponsor of a similar measure introduced this year, all of the signers score zero on the Human Rights Campaign's Congressional Scorecard, a measure of a lawmaker's support for gay and lesbian rights in Congress.

Included are many of the party's most vociferous opponents of gay rights, including Representatives Michele Bachmann of Minnesota, Jason Chaffetz of Utah, Virginia Foxx of North Carolina, Jim Jordan of Ohio and Steve King of Iowa.

Also included are House Minority Leader John A. Boehner of Ohio and Minority Whip Eric Cantor of Virginia.