(CNN) A legal complaint filed by a conservative law firm in Wisconsin is arguing that the state should remove 234,000 voters from the state's voter rolls because they may have moved recently.

The complaint , filed Tuesday by the Wisconsin Institute for Law and Liberty against members of the Wisconsin Elections Commission, says state law requires the commission to remove from the active voting rolls voters who don't respond to a recent mailing, made as part of a regular effort to update voter rolls, within 30 days.

The commission, however, says it's allowing voters to stay on the rolls through the spring of 2021, based on a June vote by the commission.

"State agencies comprised of political appointees and unelected staff do not have the authority to invent or amend policy contrary to state law," the institute's president and general counsel, Rick Esenberg, said in a statement.

"Whatever the intent of the Wisconsin Election(s) Commission's action, it is illegal and must be remedied immediately."

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