The centerpiece election legislation from congressional Republicans would require voters to prove their citizenship when registering, raising concerns among state election officials about how it would be implemented and who would pay for it. In recent interviews, secretaries of state from both parties said they were wary of federal lawmakers creating state election rules and of costly new procedures that would come with them, including collecting and storing sensitive documents. Maine Secretary of State Shenna Bellows said there is no federal database that states can use to confirm a person's citizenship status.