At least three U.S. lawmakers said on Tuesday healthcare providers were blocked from the Medicaid payment portal after the Trump administration announced a federal funding pause, even as the White House said the program was exempted.

The White House Office of Management and Budget says its program freeze is limited, but states report widespread disruption in online Medicaid portals.

A funding freeze ordered by the Trump administration has sparked widespread confusion about its effects on government programs such as Medicaid.