Texas Senator Ted Cruz, the first declared candidate for a 2016 presidential nomination, and Republican Senate Majority Leader Mitch McConnell are among 57 U.S. lawmakers asking the Supreme Court to reject gay marriage and leave the issue up to the states.
Their filing on Friday is among a flurry of submissions to the nine justices, who are set to hear argument over the issue on April 28. Same-sex marriage is currently allowed in 37 states and the District of Columbia.
The high court decided in January to consider whether the same-sex couples have a right to wed under the U.S. Constitution, taking up cases from Kentucky, Michigan, Ohio and Tennessee.