Federal and state prosecutors in West Virginia announced Tuesday that it they had charged a U.S. Postal Service mail carrier with attempted fraud for allegedly tampering with requests for vote-by-mail absentee ballots.

A joint statement by West Virginia Attorney General Patrick Morrisey, U.S. Attorney Bill Powell, and Secretary of State Mac Warner said:

Thomas Cooper, 47, of Dry Fork, stands charged with attempting to defraud the residents of West Virginia of a fair election. An affidavit accompanying the criminal complaint states Cooper fraudulently altered eight absentee ballot requests in Pendleton County, of which the complaint states he fraudulently changed the party affiliation on five from Democrat to Republican.

“Manipulating one’s absentee ballot or application is not a laughing matter – it’s a federal offense,” Attorney General Morrisey said. “We must protect the integrity of the ballot box, and this demonstrates the aggressive action we will take to do so. It is more important now than ever for voters to watch for unexplained or suspicious marks and/or any other irregularity with their ballot. If something looks suspicious, let us know right away.”

The affidavit states Cooper accessed the ballot requests through his employment as a rural mail carrier. He was responsible for mail delivery in the three towns from which the tampered requests were mailed – Onego, Riverton and Franklin.

According to the affidavit, Cooper admitted to altering some of the requests.

Local news station WTRF reported that the attempted fraud had been caught before it affected the election itself.

The announcement came at roughly the same time that Twitter assigned a fact check warning to President Donald Trump for his claims that voting by mail was uniquely susceptible to fraud.

It was the first time that Twitter had used such a label with one of Trump’s tweets.

Joel B. Pollak is Senior Editor-at-Large at Breitbart News and the host of Breitbart News Sunday on Sirius XM Patriot on Sunday evenings from 7 p.m. to 10 p.m. ET (4 p.m. to 7 p.m. PT). His new book, RED NOVEMBER, is available for pre-order. He is a winner of the 2018 Robert Novak Journalism Alumni Fellowship. Follow him on Twitter at @joelpollak.