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The American Civil Liberties Union of Nebraska has asked a federal judge not to let a state prison inmate and his transgender fiancée join their legal challenge to Nebraska's ban on same-sex marriage.

Earlier this month, Harold B. Wilson and Gracy Sedlak, formerly named John Jirovsky, filed a motion in U.S. District Court in Omaha to allow them to intervene in the lawsuit.

On Monday, attorneys for the ACLU filed an objection to the move, arguing that the couple has failed to demonstrate or allege that the seven Nebraska couples already in the suit do not adequately represent their interests.

The addition of extra parties will unduly delay and complicate the case, attorney Amy Miller of the ACLU Foundation wrote.

Allowing Wilson and Sedlak to intervene, she said, would "open the floodgates to countless other proposed intervenors."

Miller said that a speedy resolution is critical in this case, and, if the lawsuit is successful, all same-sex couples in Nebraska will be able to marry.