Last month, approximately 30,000 non-citizens living in Colorado received letters urging them to register to vote. According to Fox News, the postcards were sent in error on September 27, after department employees compared a list of names of 102,000 people provided by the Electronic Registration Information Center to a database of Colorado residents issued driver’s licenses.

Residents who have received special licenses for non-citizens are included in the Department of Revenue’s driver’s license database. However, according to Griswold’s office, it lacked formatting information that typically would have enabled the Department of State to take those names out of the mailings before they were sent out.

The postcards are in English and Spanish and state that residents must be U.S. citizens and at least 18 years old to register. While the cards tell recipients how to register, they are not registration forms. Griswold’s office maintains that any non-citizens who received the card will not be allowed to register to vote. Additionally, her office claims it will employ measures, such as daily comparisons of the Social Security numbers necessary for each registration and sending questionable cases to the district attorney.

Colorado’s Republican Party chair, Kristi Burton Brown, slammed Griswold, saying, “Jena Griswold continues to make easily avoidable errors just before ballots go out.”