There are 300 more suspected noncitizens on Colorado’s voter rolls, Secretary of State Gessler announced Tuesday in the latest chapter of a contentious national debate over what Republicans say is vulnerability in the voting system.

The latest figures are from the 3,903 people who received letters from Gessler’s office questioning their citizenship in August. During a first round of checks, Gessler said 141 others were found to be possible noncitizens based on a federal immigration database.

Critics of Gessler, who is a Republican, have questioned his political motives and argue the checks have the potential to disenfranchise eligible voters. Some of the people who have received letters questioning their citizenship have turned out to be U.S. citizens, and a few of the original 141 have maintained they are citizens.

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