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"You're really sabotaging the Postal Service's ability to sort mail efficiently and you are undermining postal workers' commitment to that every day delivery," Sen. Hassan said.

During his first appearance before Congress, DeJoy said he would not bring back mail-sorting machines and mailboxes that have been pulled from service in recent weeks, saying they were routine responses to changes in mail volume, which has dropped in the coronavirus pandemic. He said he had not ordered those changes.

DeJoy said he was considering "dramatic changes" to shore up Postal Service finances after the Nov. 3 election. DeJoy suspended existing cost-cutting measures on Tuesday after they led to widespread service delays.

Those delays have raised concerns that millions of mail ballots could go uncounted in November, when up to half of U.S. voters could vote by mail.