TOPEKA, Kan. (AP) — Gov. Sam Brownback says he’s disappointed the state’s backlog in unprocessed Medicaid applications is four times as large as previously thought.

The Topeka Capital-Journal reports that Brownback discussed the situation in a brief interview as the state and a contractor battle over who bears blame for the error. The number of unprocessed Medicaid applications stood at about 3,500 people until the state acknowledged earlier this month the actual figure was more than 15,000.

Brownback described the situation as “frustrating.” Brownback is reiterating the steps the state is taking to whittle down the backlog, such as retaining temporary staff.

Brownback also defended the overall performance the state’s privatized Medicaid program, known as KanCare. It grew out of Brownback administration efforts during the governor’s first term.