WASHINGTON — The voters of Utah and Idaho, two deeply Republican states, defied the will of their political leaders in November and voted to expand Medicaid under the Affordable Care Act. Now those leaders are moving to roll back the expansions — with encouragement, they say, from the Trump administration.

Utah’s ballot measure, approved by 53 percent of voters, would expand Medicaid to cover people with incomes up to 138 percent of the poverty level and pay the state’s share with a small increase of the sales tax. Under the ballot initiative, 150,000 people are expected to gain coverage, starting April 1.

In Idaho, more than 60 percent of voters supported a ballot measure to expand Medicaid.

But in both states, the Republican legislatures are looking for ways to roll back those votes.

The bill barreling through the Utah Legislature was “an effort to override the will of the people,” said Matthew Slonaker, executive director of the Utah Health Policy Project, a nonprofit group that supported the full expansion of Medicaid.

Utah lawmakers, worried that the sales tax increase might not fully cover the costs, are rushing through a bill that would limit the expansion of Medicaid to people with incomes less than or equal to the poverty level.

State officials say that the bill, which is estimated to cover 90,000 people, could be on the desk of Gov. Gary R. Herbert, a Republican, in a week or two.

Idaho lawmakers are considering restrictions, such as work requirements, to limit the reach of the voters’ will.

In both cases, state Republicans may need Washington’s help. Utah’s legislative plan is contingent on federal approval of a waiver that would allow the state to get extra federal money without the full expansion of Medicaid envisioned in the Affordable Care Act.

Paul Edwards, a deputy chief of staff for Herbert, said state officials had many conversations with Trump administration officials.

“The governor came away quite encouraged,” Edwards said. “The most important conversations have been on the telephone between Gov. Herbert and Seema Verma,” the administrator of the federal Medicaid agency.

This article originally appeared in The New York Times.