DETROIT (AP) -- The state of Michigan's defense of a ban on gay marriage is off to a rocky start after a judge refused to allow the first witness to testify.
Sherif Girgis is a law student at Yale University and a doctoral candidate at Princeton University. He has written and talked about a historical defense of marriage between a man and a woman.
Federal Judge Bernard Friedman says Girgis will be an expert witness -- someday. Friedman says Girgis' opinions won't help him decide this case.
Two Detroit-area women are challenging Michigan's ban on same-sex marriage, which was approved by voters in 2004.
The state attorney general's office is defending the amendment this week and asked for a break Monday to summon another witness.