(Associated Press) A lesbian couple’s desire to adopt each other’s children has grown into a potentially groundbreaking challenge to Michigan’s ban on same-sex marriage.

Two Detroit-area nurses filed a lawsuit to try to overturn restrictions on adoption by same-sex partners. But at the judge’s invitation, the case took an extraordinary turn and now will test the legality of a 2004 constitutional amendment that stipulates Michigan only recognizes marriages between a man and a woman.

U.S. District Judge Bernard Friedman will hear arguments in the case Thursday at a Detroit law school, although he hasn’t indicated when he’ll make a ruling. If he concludes the amendment violates the U.S. Constitution, gay-marriage supporters say same-sex couples would immediately be allowed to wed and adopt children.

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