Already five Republican senators have said they can not vote for their party's plan as it stands now, with four them saying it does not go far enough to curb provisions under the Obama law and one saying the cuts in healthcare payments for the poor go too far.
As lawmakers made speeches about the legislation on the Senate floor, a protest erupted outside McConnell's personal office, with many people in wheelchairs blocking a hallway, holding signs and chanting: "No cuts to Medicaid".
The Senate bill would also erase the tax penalties Obama's 2010 law imposes on people who don't purchase insurance.
Casey, a Democrat, said that's disingenuous, because the commonwealth doesn't have the money to make up for federal cuts.
Although few Republicans have strongly supported the bill as it stands, they say it's a start. Warren is a leading liberal and defender of the current health law.
Neither he nor fellow Arizona Sen. "We should not be voting on this next week". The Trump White House keeps talking about making government more "transparent".
He told ABC's "This Week" the GOP has "at best, a 50-50 chance".
To pass the Senate, with unanimous Democratic opposition expected, Republicans can only afford two defectors.
Sen. Susan Collins of ME said it would be "very difficult" for President Trump and GOP leaders to get her support this week for the Senate's health care bill.
Iowa Sen. Joni Ernst is suggesting Iowans would not be losing Medicaid coverage even as the Senate GOP health care bill would phase out financing to expand the low-income insurance program. Bernie Sanders went so far to call it "by far the most harmful piece of legislation [he's] seen in [his] lifetime".
Five Republican senators - including Ted Cruz - threatened "NO" votes. Defections from just three of the Senate's 52 Republicans would doom the legislation.
Several GOP senators pressed Senate leaders, unsuccessfully, to include additional funding for addiction treatment to compensate for the spending cuts to Medicaid. Ron Johnson of Wisconsin, who said on NBC's Meet the Press, "I would like to delay the thing".
If three Republicans defect, the party can not reach the majority vote it needs to pass the measure.
Speaking on the release of the bill, which was kept under wraps until Thursday, Trump said: "It's going to be very good", adding: "A little negotiation, but it's going to be very good".