A coalition of 24 Democrat-led states and the District of Columbia sued the U.S. Postal Service on Wednesday, seeking to block new mail-in ballot safeguards from taking effect before November’s midterm elections.

The lawsuit, filed in federal court in Massachusetts, argues that the rule exceeds executive authority, conflicts with federal law, and intrudes on states’ constitutional power to administer elections. The states also warned that implementing the changes on a compressed timeline could disrupt election preparations and risk disenfranchising eligible voters.