A Catholic school in Oklahoma is asking the Supreme Court to clear the way for it to become the nation's first religious charter school funded directly by taxpayers.

The justices have allowed vouchers for religious schools and required equal treatment in tuition programs. But direct government payments to religious public schools pose a new test.

A ruling for St. Isidore of Seville Catholic Virtual School would allow direct and complete taxpayer funding for a faith-based school for the first time.