The Obama administration is asking the Supreme Court to strike down the federal law defining marriage as a union between only a man and a woman.

The request regarding the 1996 Defense of Marriage Act was made Friday in a brief by Solicitor General Donald Verrilli that argues the law is unconstitutional because it violates “the fundamental guarantee of equal protection.”

The high court is set to hear two cases next month on the issue: the constitutional challenge on Proposition 8, the 2008 California that allowed same-sex marriages in the state that two years later was overturned, and United States v. Windsor, which challenges DOMA.

Edith Windsor, a California resident, was married to her female partner in Canada in 2007 but was required to pay roughly $360,000 in federal estate taxes because the marriage is not recognized under DOMA.

The law “denies to tens of thousands of same-sex couples who are legally married under state law an array of important federal benefits that are available to legally married opposite-sex couples,” Verrilli’s brief in part states.

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