He’s got 2 problems: (1) standing and (2) availability of a statutory remedy. AZ law grants “interested beneficial parties” the ability to petition for mandamus. It would appear that an eligible elector “could” be construed as an interested beneficial party. But that is not a given; and runs into the issue of “concrete and particularized” injury required to have standing to bring suit. There is also a “quo warranto” statute. He can petition the AZ attorney general to initiate removal proceedings for a party unlawfully holding AZ office. That the AG was also fraudulently elected and unlikely to pursue the case is no basis to petition the court for this alternative mandamus against the trial court judge in Lake’s case. You can petition for quo warranto mandamus to compel the AG to bring the case.