A United States Postal Service (USPS) worker wearing a mask delivers mails during the COVID-19 pandemic in New York, the United States, April 13, 2020. (Photo by Michael Nagle/Xinhua)

DeJoy recently launched sweeping operational changes to the USPS, including a ban on extra trips by postal workers for on-time delivery, crackdowns on overtime pay and shakeup in agency leadership, which he said were aimed at addressing the agency's dire financial situation.

WASHINGTON, Aug. 16  -- U.S. House Oversight Committee on Sunday called for the chief of the country's postal service to testify before the panel about the cost-cutting overhaul to the agency, which lawmakers worried would sabotage the presidential election later this year with expected surging of mail-in ballots due to the coronavirus pandemic.

"Over the past several weeks, there have been startling new revelations about the scope and gravity of operational changes you are implementing at hundreds of postal facilities without consulting adequately with Congress, the Postal Regulatory Commission, or the Board of Governors," House Oversight Committee Chairwoman Carolyn Maloney, a New York Democrat, wrote in a letter on Sunday to Postmaster General Louis DeJoy, who was appointed by President Donald Trump in May this year and assumed office in June.