The United Auto Workers (UAW) union is challenging the legitimacy of a handful of deciding ballots in a union election at a Kentucky electric vehicle battery complex.

The two-day vote among workers at the BlueOval SK battery park in Glendale, Kentucky, wrapped up on August 27, with employees tasked with deciding on whether to join the UAW. The Associated Press reports that the UAW is claiming that it won a narrow victory, which will now rely on whether it's successful in challenging 41 ballots that the union claims were "illegitimate and should not be counted." Without those votes, the final tally would be 526-515 in favor of unionizing.

“We believe they are illegitimate and represent nothing more than an employer tactic to flood the unit and undermine the outcome,” the UAW said in an August 27 statement, asserting that the challenged ballots "are not part of the group of workers who built their union from the bottom up."

Eligible voters at the battery complex included full and part-time production and maintenance workers during the payroll period that ended on July 26. It's theorized that the challenged ballots could include safety emergency response staff members, whose eligibility was not determined by the National Labor Relations Board when the agency allowed the election to move forward. The NLRB will next review the disputed ballots and rule on whether they will be counted in the final tally.