Maine’s Republican governor has said federal regulators want to know how Maine would pay for Medicaid expansion. But it’s unclear just how that issue will play out in Maine, the first state to pass Medicaid expansion under Republican President Trump’s administration.

States must file routine paperwork to get federal Medicaid expansion funding under former Democratic President Obama’s signature health care law. The Centers for Medicare & Medicaid Services told The Associated Press on Tuesday that it works to ensure states pay for their share of an expansion with “proper” financing.