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In the video published by James O'Keefe the founder of Project Veritas the alleged USPS employee works at the Barlow post office branch in Michigan's Traverse City.
The employee alleged that his boss directed him and his colleague on 4 November to collect any ballots they find in the outgoing mail like mailboxes, collection boxes, so that they can be hand-stamped with the previous day's date (3 November).
The whistleblower added that he was told by a postal worker in another branch that he had allegedly seen the postmaster stamping ballots with the previous day's date.
O'Keefe has now claimed that his organisation has been contacted by the office of the Inspector General of USPS and they are now considering launching an investigation.
It was earlier reported that a prominent Trump supporter shared voting records which allegedly show dead people having cast their votes in Michigan. The voters were born in 1900, 1901 and 1902 - older than the oldest living American.