WASHINGTON (AP) — Governors of both major political parties are warning that a little-noticed regulation proposed by President Donald Trump's administration could lead to big cuts in Medicaid, reducing access to health care for low-income Americans. The arcane fiscal accountability rule proposed by the Centers for Medicare and Medicaid Services, or CMS, would tighten federal oversight and approval over complex financing strategies states have long used to help pay for their share of the $600 billion program.