The FBI has issued a subpoena to the Arizona State Senate seeking records from its review of the 2020 election results in Maricopa County, according to officials familiar with the matter.

The subpoena was served in recent days as part of what appears to be an expansion of federal investigations into 2020 voting-related activities. The request targets documents from the Republican-led review that examined ballots and voting equipment from Arizona's most populous county following the 2020 presidential election.

Arizona State Senate President confirmed that he has complied with the federal subpoena, which was received last week. The Senate had overseen the months-long review of Maricopa County's election results, which became a subject of significant controversy and legal challenges.

The 2020 election review in Arizona drew national attention as Republican state legislators commissioned a private company to conduct what they termed an audit of the county's presidential election results. The process faced criticism from election officials and voting rights groups over its methods and procedures.

The FBI's interest in the Arizona review records suggests federal investigators are examining activities related to the 2020 election aftermath. The subpoena represents the latest development in ongoing federal scrutiny of various efforts to challenge or review 2020 election results in multiple states.