Kari Lake filed a public records lawsuit against Maricopa County, Ariz., over the election, per AP.
Lake, who ran for governor, has flagged several voting issues as ones that disenfranchised voters.
Maricopa, the most populous county in the state, is set to certify its election results on Monday.
Lake, a former television journalist, was edged out by Arizona Democratic Secretary of State Katie Hobbs in the general election 50.3%-49.7%.
But Lake, who has refused to acknowledge Biden's 2020 win in Arizona, has so far declined to concede to Hobbs.