MADISON, Wis. (WRN) — Wisconsin leaders say slow mail delivery could stamp out some votes.

Governor Tony Evers and U.S. Senator Tammy Baldwin are urging the U.S. Postal Service to fix mail delivery issues before Wisconsin’s upcoming elections. In a letter to postal officials, they pointed to absentee ballots that arrived too late to be counted in the spring election. The pair also wants the Postal Service to drop a proposed rule they say could further delay mail-in voting.

State election officials report many clerks experienced mail problems in April, with some ballots taking more than a week to arrive.

Wisconsin’s primary is August 11th, with the general election set for November 3rd.