It’s not just mail-in votes. Operational and organizational changes at the United States Postal Service are causing delays in delivery of medications to millions of Americans.

A group of U.S. senators, including Mark Warner (D-VA), are calling on Postmaster General Louis DeJoy to reverse all operational and organizational changes that have caused the delivery issues.

“The Postal Service is an essential public institution that must uphold its duty to serve every community. Your recently implemented changes pose an unacceptable threat and continue to have a devastating effect on communities that rely on consistent access to medication through the mail. We have received numerous reports from seniors about delays in receiving their prescriptions through the mail, leaving some without life-sustaining medication for days. Others have been forced to obtain emergency prescriptions from their doctors and pay out-of-pocket for medication because their original prescriptions covered by insurance never arrived,” the senators wrote in a letter to DeJoy released today.