The 2021 Maricopa County presidential ballot audit, commonly referred to as the Arizona audit, was an examination of ballots cast in Maricopa County during the 2020 United States presidential election in Arizona initiated by Arizona Senate Republicans and carried out by private firms. Begun in April 2021, the audit stirred controversy due to extensive previous efforts by Trump and his allies …

https://en.wikipedia.org/wiki/2021_Maricopa_County_presidential_ballot_audit