A federal appeals court on Thursday bucked a recent trend of pro-gay marriage decisions by upholding state bans or restrictions in Kentucky, Michigan, Ohio and Tennessee, pressuring the U.S. Supreme Court to take up the issue.

The 2-1 ruling, by the Cincinnati-based 6th Circuit U.S. Court of Appeals, is the first ruling by a federal appeals court that upholds bans on same-sex marriage. Gay marriage advocates said they would immediately seek U.S. Supreme Court review.

The high court, if it agrees to hear the case, could potentially issue a decision by the end of June saying once and for all whether any states can ban gay marriage.