The Trump administration is facing a lawsuit filed Friday over a provision in the $2.2 trillion coronavirus relief package that denies stimulus checks to more than 1 million U.S. citizens married to undocumented immigrants.

The plaintiff is a man using the pseudonym John Doe who claims the administration is discriminating against him “based solely on whom he chose to marry.” The lawsuit, filed in a federal court in Chicago, cites a Migration Policy Institute report that estimates 1.2 million unauthorized immigrants in the country are married to U.S. citizens.

The bill distributes stimulus checks through the IRS. Most people who have filed taxes in the U.S. and have Social Security numbers are eligible to receive a stimulus check.

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However, in order to qualify under a provision implemented by the Trump administration, both spouses in families that file joint tax returns must have Social Security numbers, unless one of them is a member of the military.

John Doe, who is a U.S. citizen, claims that his wife pays taxes with a Taxpayer Identification Number, which is issued by the IRS.

The litigants claim that Trump, Treasury Secretary Steven Mnuchin Steven Terner MnuchinOn The Money: Powell, Mnuchin stress limits of emergency loans | House seeks to salvage vote on spending bill | Economists tell lawmakers: Kill the virus to heal the economy Economists spanning spectrum say recovery depends on containing virus Powell, Mnuchin stress limits of current emergency lending programs MORE and Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Senate GOP aims to confirm Trump court pick by Oct. 29: report Trump argues full Supreme Court needed to settle potential election disputes MORE (R-Ky.) did not treat John Doe "as equal to his fellow United States citizens."