Gov. Rick Snyder says Michigan won't recognize more than 300 same-sex marriages performed last weekend.
The marriages were performed Saturday before a federal appeals court suspended a decision that overturned the state's ban on gay marriage.
Snyder's announcement Wednesday closes the door to certain benefits granted to Michigan married couples. The move comes a day after an appeals court indefinitely stopped any additional same-sex marriages.
Snyder says the marriages were legal at the time but the stay means the ban now is back in effect.
The court is reviewing a decision by Detroit federal Judge Bernard Friedman, who struck down a 2004 constitutional amendment that says marriage is between a man and a woman.
It will take months for the appeals court to affirm or reject Friedman's opinion.