That means Republicans can only afford two defections for the legislation to pass.
Adding to this concern is the President's budget, which targets Medicaid with a proposed cut of $610 billion.
WASHINGTON (AP) - Republican Sen.
"I think they have, at best, a 50-50 chance of passing this bill", Senate Democratic leader Chuck Schumer of NY said on ABC.
If there was any hope that Senate Republicans could bring some sanity into the national discussion around the future of our health care system, such hope completely vanished on Thursday.
McConnell has acknowledged that he's willing to change the measure before it's voted on.
The four are sticking together to get changes such as fewer government subsidies created to make health insurance more affordable. It did not sound like a lengthier phase-out of the Medicaid expansion would satisfy Heller the way it might satisfy, say, Ohio Sen.
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Asked about the bill's impact on Medicaid insurance coverage for lower-income Iowans, Ernst said, "I wouldn't say they are losing it".
The American Health Care Act, passed by the House of Representatives, would take health care away from 23 million Americans, including 777,000 Pennsylvanians.
The Senate bill would also erase the tax penalties Obama's 2010 law imposes on people who don't purchase insurance.
"What will be available are policies that don't cover a number of benefits that people are used to getting coverage for today", Blumberg said.
Four conservative senators expressed opposition but openness to talks: Sens.
Hours after the measure was unveiled to Congress, Rand Paul of Kentucky, Ron Johnson of Wisconsin, Ted Cruz of Texas and Mike Lee of Utah said in a joint statement that they were not ready to vote in favour of the legislation. More profoundly, both the House and the Senate's bills would destroy a national commitment made 52 years ago to provide health care to the elderly and low-income Americans. "Well, they're also four good guys, four friends of mine, and I think that they'll probably get there", he said. "And we'll see if we can take care of that".
Amid the scrum, there are signs Republican opposition is only growing.
The House approved its version of the bill last month. He earlier called a House reform bill, which contained similar funding cuts, "mean". She said she intends to wait for a Congressional Budget Office analysis before making a decision.
The GOP-controlled Senate bill introduced Thursday would phase out federal money to states which opted to expand the low-income health insurance program.