House Republicans have withdrawn their defense from all cases challenging the Defense of Marriage Act (DOMA).

At the direction of GOP House leadership, the Bipartisan Legal Advisory Group (BLAG) stepped in to defend DOMA in numerous legal challenges after the Justice Department announced it would no longer do so.

Following a June ruling from the Supreme Court striking down section 3 of DOMA, a key provision which prohibited federal agencies from recognizing the legal marriages of gay and lesbian couples, BLAG began withdrawing from the remaining cases.

According to Equality On Trial, BLAG this week withdrew from three remaining challenges.

In one such case, Bishop v. United States (formerly Bishop v. Oklahoma), plaintiffs are making broad constitutional arguments challenging Section 2 of DOMA, which allows states to ignore the legal out-of-state marriages of gay couples, and Oklahoma's marriage ban.

Without Section 2 of DOMA, states that limit marriage to heterosexual couples would likely have to recognize the marriages of gay couples celebrated in one of the 13 states plus the District of Columbia where such unions are legal.

(Related: House Republicans end defense of DOMA, similar laws that ban gay marriage.)