The American Civil Liberties Union of Hawaii filed a legal challenge Thursday to the primary election on behalf of six voters in Puna on the Big Island who said they were unable to vote because of the damage left by Tropical Storm Iselle. The challenge alleges the state failed to take steps necessary to ensure Puna voters could exercise their constitutional right to vote. The ACLU asked the court to give any voter affected by Iselle the opportunity to vote by September 20, the deadline under the state Constitution for tabulating primary results. The lawsuit also wants the court to invalidate a state law giving Scott Nago, the state's chief election officer, discretion over how to conduct a postponed vote after a natural disaster. The ACLU argues that under the state Constitution, the Legislature should prescribe how such makeup elections are conducted.