(WASHINGTON) — The White House and Republican leaders are talking to rank-and-file lawmakers about revising the GOP health care overhaul, hoping to keep a rebellion by conservatives and moderates from snowballing and imperiling the party’s showpiece legislation.

Four days after a congressional report projected the bill would pry coverage from millions of voters, signs of fraying GOP support for the legislation were showing. The measure would strike down much of former President Barack Obama’s 2010 overhaul and reduce the federal role, including financing, for health care consumers and is opposed uniformly by Democrats.

In a fresh test of Republicans’ willingness to embrace the legislation, the House Budget Committee was considering the measure Thursday. Republicans expressed confidence the bill would be approved, but the vote could be tight. The panel can’t make significant changes but was expected to endorse non-binding, suggested changes to nail down votes.

The bill would eliminate the tax penalty that pressures people to buy coverage and the federal subsidies that let millions afford it, replacing them with tax credits that are bigger for older people. It would cut Medicaid, repeal the law’s tax increases on higher earning Americans and require 30 percent higher premiums for consumers who let coverage lapse.

Overt GOP opposition grew after the nonpartisan Congressional Budget Office projected Monday that the legislation would push 24 million Americans off coverage in a decade and shift out-of-pocket costs toward lower income, older people. Obama’s law has provided coverage to around 20 million additional people

House Speaker Paul Ryan, R-Wis., told reporters Wednesday that leaders could now make “some necessary improvements and refinements” to the legislation. But he declined to…