The Biden administration is threatening to recoup Covid-19 relief funds sent to Arizona over state provisions that it says discourage families and school districts from following federal guidance recommending face coverings in schools.

At issue are two state programs that are meant to help schools and students but that direct funding away from jurisdictions with mask requirements. Arizona’s Education Plus-Up Grant Program provides $163 million in funding to schools, but districts that require face coverings are ineligible. And its COVID-19 Educational Recovery Benefit Program provides for up to $7,000 for parents if their child’s school requires face coverings or quarantines after exposure. It lets parents use the money for private school tuition or other education costs and its design mirrors the state’s existing school voucher program.

The program has had few takers, despite Republican Gov. Doug Ducey’s office touting it as a response to an outcry from parents. As of last week, only 85 students were getting the vouchers and less than $600,000 of the $10 million had been allocated.