The Minnesota Voters Alliance, which is suing state and local officials over allegations of fraud in Minnesota elections, has been accused of not registering as a charitable organization.

The American Civil Liberties Union of Minnesota filed the complaint Wednesday with the Minnesota Attorney General's Office.

The ACLU and the Alliance are on opposite sides in the state's battle over changes to Minnesota's voting and registration laws, which includes a photo ID requirement for all voters. That issue is to be decided by voters when they consider a proposed constitutional amendment in November.

The Alliance supports Photo ID and the related changes; the ACLU opposes the changes.

"If they want little old ladies to prove who they are, they should prove who they are," Carolyn Jackson, lobbyist for the ACLU, said of the Voters Alliance's failure to register as a charity. The ACLU says the Voters Alliance is raising money to support its lawsuit and should be required to register.

Andy Cilek, head of the Alliance, said his organization was previously unaware of the requirement, and will file the necessary report if it is required to do so. He noted that the organization has filed all the necessary reports with the IRS and the Secretary of State.

Cilek said it appears that his group has some time to file the report with the Attorney General, and is not late in doing so.

The lawsuit from the Minnesota Voters Alliance, filed in February, focuses on voters who register on the Election Day but whose residence cannot be verified even after the votes are counted.

Cilek said he believes the ACLU action is "retribution" for a claim his group filed against the League of Women Voters.