On May 8, fifteen states filed an amicus brief in the U.S. Supreme Court in Libby v Fecteau, 24A1051. This is the case filed by a Maine legislator to restore her right to vote on bills on the floor of the State House of Representatives. The states are Alabama, Arkansas, Florida, Georgia, Idaho, Iowa, Kansas, Louisiana, Montana, Nebraska, Ohio, Oklahoma, South Carolina, Virginia, and West Virginia.

The brief argues that the doctrine of legislative immunity does not apply because depriving a member of the legislature of her ability to vote on bills is not a normal legislative function. The brief refers to the 1920 instance when the New York legislature expelled all elected Socialist Party members. It quotes Charles Evans Hughes as saying that action was wrong. Hughes was Chief Justice of the U.S. Supreme Court, and he had also been the Republican nominee for President in 1916.