The U.S. Supreme Court has rejected President Donald Trump’s attempt to limit mail voting by imposing new Postal Service regulations for the midterm elections. The decision announced late Monday allows mail voting to continue as usual. It also suggests that the court is unlikely to support similar efforts in future elections. Voting rights advocates and state officials expressed relief, given that roughly a third of voters in the U.S. use mail ballots. The decision, which came as mail voting is already underway in some states, was especially welcome in states that conduct elections primarily by mail.