US President Donald Trump at 2020 Republican National Convention in Charlotte

WASHINGTON, Aug. 25, 2020 (Xinhua) -- U.S. Postmaster General Louis DeJoy (R) arrives to testify before the U.S. House Committee on Oversight and Reform on Protecting the Timely Delivery of Mail, Medicine, and Mail-in Ballots on Capitol Hill in Washington, D.C., the United States, on Aug. 24, 2020.