WASHINGTON, D.C. (WNAX) – President Trump continues to criticize the use of mail in ballots, suggesting that if he loses, the election is “rigged.”

South Dakota Senator John Thune says the President could turn off some of his own voters.

Thune says people have to have confidence in the election process.

Thune says voting issues have been rare and isolated.

The U.S. Postal Service is expecting up to one hundred million ballots in the mail by election day.