The uncertainty comes as the nonpartisan Congressional Budget Office released its estimate on the bill. Obamacare has been something most Republicans have been united against, but there is no doubt that the healthcare plan has helped millions of Americans. This bill has been criticized for providing tax cuts to the rich and because it would leave millions once more without insurance, detractors say.
"Unless we gave it massive subsidies, it's not going to be there", he said.
They also call for changes to the provision that rolls back the expansion of Medicaid, the health coverage program for the poor and the disabled.
Speaking on Fox News, Gary Cohn, director of the White House National Economic Council, said: "We will see what the score is, in fact in the past, the CBO score has really been meaningless".
"No palace intrigue", Ryan said. That's one vote shy of what would have been needed to deal a damaging and embarrassing - but not fatal - setback to the party's showpiece legislation. The CBO's current director, Kevin Hall, was appointed by Republicans in 2015. The 2010 law, Democratic President Barack Obama's signature legislation, provided 20 million previously uninsured Americans with health coverage. It predicted Monday that 24 million people would lose health coverage by 2026 but that there would be a cut to the federal budget deficit of $337 billion over the first decade.
In the Senate, a senior Republican said even if the health bill passes the House, "it wouldn't pass the Senate".
Mark Walker, R-N.C., the chairman of the Republican Study Committee, told reporters.
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A third change is the assurance that tax credits for people who purchase insurance in the independent market won't be used for abortion.
The House bill would create new, leaner tax credits for health insurance, cap federal spending on Medicaid for low-income people and reverse tax increases on wealthy Americans used to finance Obama's statute.
Last week, ratings agency Standard and Poor's estimated that 6 million to 10 million people could lose coverage if the Republican plan passes. Furthermore, if carefully constructed, a public option like Medicare for All would also do wonders for USA businesses by relieving them of the burden of providing health coverage for their employees - at a cost significantly lower than what they now pay.
Enrollment in these individual insurance plans was down by about 500,000 people from 2016 by the end of January, it said.
Republicans remain deeply divided over their USA healthcare overhaul, Trump's first major legislative initiative and one that aims to make good on his campaign pledge to repeal and replace the healthcare plan put in place by his Democratic predecessor, Barack Obama.
"You know why? Because this isn't a government mandate", Ryan told NBC's Meet the Press.
In a joint letter sent Thursday to the leaders of the House and Senate, the governors of Ohio, Michigan, Nevada and Arkansas argued that the "current version" of the American Health Care Act in the House hurts states. We will communicate the results of the House vote to our members and the public through The Bulletin, a print publication that goes to all of our members, as well as through emails, social media, and other communications channels.