The Arizona Senate is poised to begin a major audit of over two million ballots cast in the 2020 election in the state’s largest county, a process the state Senate president claims has been stymied by county officials and which the county claims rests on legally uncertain ground.

Senate subpoenas to the Maricopa County Board of Supervisors for information and equipment needed to perform the audit have been pending since Dec. 15, 2020 and were upheld by a judge on Feb. 25. In mid-March, the state Senate announced that Republicans in that chamber would be conducting a “broad and detailed” review of Maricopa’s ballots, one that would involve “testing the machines, scanning the ballots, performing a full hand count and checking for any IT breaches,” among other approaches.