The president of the Arizona Senate and the chairman of the Arizona Senate Judiciary Committee filed a lawsuit on Dec. 21 asking the state’s superior court to enforce a pair of subpoenas that sought ballot tabulation equipment and voting records from Maricopa County.

Arizona Senate President Karen Fann and Arizona Senate Judiciary Committee Chairman Eddie Farnsworth, both Republicans, issued the subpoenas to the Maricopa County Board of Supervisors on Dec. 15. In response, the board voted against complying and filed a lawsuit to determine whether it is obligated to produce the materials sought.

The Arizona Senate lawsuit (pdf) states that after the Nov. 3 election, state lawmakers were inundated with questions and complaints from citizens who were concerned with the integrity of the election and whether their votes were correctly counted.

“In consultation with President Fann, Chairman Farnsworth determined that these widespread concerns warranted a comprehensive independent investigation by the Judiciary Committee, to include a full forensic audit of tabulation devices and other voting equipment in Maricopa County,” the lawsuit states.

The senators plan to use the results of the audit to determine whether to certify or reject the presidential electors for Joe Biden, which have been transmitted to U.S. Congress and are due to be counted on Jan. 6.

The first subpoena requested access to ballot tabulations used in Maricopa County for the Nov. 3 election, in addition to related software, hardware, and removable media. The senators also requested voter rolls, voter records, paper ballots, and other records. The second subpoena demanded a number of electronic files, including images of all the ballots cast in the county on Nov. 3.

The county could have fulfilled a substantial part of the request by Dec. 18, but didn’t do so as of Dec. 21, according to court documents. The senators asked for an order from the court enforcing the subpoenas.

The Arizona secretary of state on Nov. 30 certified the presidential electors for former Vice President Joe Biden as the winning slate. The electors met on Dec. 14 and cast their votes for Biden. On the same day, the Republican presidential electors cast a procedural vote for President Donald Trump and sent a competing slate to Congress.

Biden ostensibly received 10,457 more votes than Trump in Arizona, a margin the lawsuit described as “exceedingly close.”

Arizona’s Republican Party filed a motion to intervene in the lawsuit filed by Maricopa County against the senators as part of its fight against complying with the subpoenas.