The Oklahoma Council of Public Affairs filed a challenge Thursday against putting the question of Medicaid expansion on the ballot in 2020.

The OCPA — an Oklahoma City-based conservative think tank — filed a challenge with the state Supreme Court, alleging an initiative petition seeking to bring Medicaid expansion to a statewide vote is unconstitutional because expanding federal health benefits in Oklahoma would allow the federal government to step on the duties of state lawmakers.

Supporters of Medicaid expansion filed an initiative petition on April 19 to let Oklahoma voters decide whether to expand the federal-state health program to cover more low-income residents. It is unclear who is funding the initiative, which would appear on the ballot as State Question 802.

OCPA is asking for the initiative petition to be barred from the November 2020 ballot.