The lawsuit filed against Postmaster General Louis DeJoy and the U.S. Postal Service on Sept. 9 argued changes implemented in June harmed access to mail services in Montana, resulting in delayed delivery of medical prescriptions, payments, and job applications, and impeding the ability of Montana residents to vote by mail.

Social media posts suggested there was a "big opportunity" for UPS and FedEx to deliver ballots for free as the U.S. Postal Service struggles with funding shortfalls.

Voters and lawmakers in several states are also complaining that some curbside mail collection boxes are being removed.