America First Legal filed a lawsuit against Arizona Secretary of State Adrian Fontes (D) over 218,000 voters who were incorrectly registered as providing proof of U.S. citizenship.

AFL announced on Thursday that the lawsuit was filed on Wednesday.

The secretary of state’s office on Monday said that an additional 120,000 Arizona residents were found to have been placed on the state's voter rolls as providing proof that they are U.S. citizens, despite the fact that they had not done so.

Approximately 79,000 Republicans, 61,000 Democrats, and 76,000 Other Party members have been affected.

The secretary's announcement came two weeks after he explained that there was an error in state systems that labeled roughly 98,000 voters as having provided documented proof of U.S. citizenship when they had not done so.

Arizona is a state with the unusual situation of bifurcated elections, in which residents who provide proof of U.S. citizenship can vote in all elections while the others may vote only in federal elections, resulting in ballots cast by voters who haven’t proven their U.S. citizenship.

AFL argues in its lawsuit that the secretary of state’s office has illegally withheld the list of 218,000 voters who have not provided citizenship proof. Fontes' office rejected a public records request for the list and county recorders have also not received the list, despite state law requiring the local offices to investigate voters registered without citizenship proof.

"We are suing the state of Arizona for refusing to provide the list of 218,000 voters who failed or refused to establish citizenship. It is absolutely imperative that we stop the dire threat of illegal alien voting, which is the gravest form of foreign election interference," America First Legal President Stephen Miller said in a statement.