With only 52 Republicans in the Senate and Democrats united in opposition, GOP leaders could afford to lose only two votes.
Mark Dayton joined members of the "This Is Medicaid" Coalition to speak out about the latest version of the new health care reform bill. Bill Cassidy, either sat or left the room until police removed the protesters.
A group of Senate Republicans spearheading a rollback of the Affordable Care Act tried to persuade three skeptical but critical senators to support their efforts over the weekend - but were unable to extract any promises that would guarantee the embattled measure's success.
Schumer said once Obamacare repeal is off the table, Democrats would work with Republicans "to find a compromise that stabilizes markets, that lowers premiums". "In the short time available, CBO and [the Joint Committee on Taxation] could not complete a full analysis on the effects of this legislation on the federal budget", the report said.
"By 2027, we're going to be spending more on Medicaid than on the [U.S.] military", said Republican Senator Lindsey Graham, who co-authored the bill with Senator Bill Cassidy of Louisiana, testifying as a witness before the committee.
The GOP bill would have fundamentally overhauled Medicaid from an open-ended federal guarantee to a system that caps funds to the states but would have given them more flexibility on how they spent those dollars. And then there's Lisa Murkowski from Alaska. "It was clear to me that the Graham Cassidy was not the answer".
Republicans had faced a Saturday deadline - the end of the fiscal year - of being able to pass healthcare with a simple majority.
On the "Rick & Bubba Show", a radio programme, Trump singled out McCain, calling his vote in July "a tremendous slap in the face of the Republican Party".
It was a major blow for President Donald Trump, who has made repealing former President Barack Obama's signature healthcare law his top legislative priority. None of their concerns could be easily fixed by changing funding formulas.
Collins voted against Republican efforts over the summer to repeal and replace the ACA.
South Dakota Sen. John Thune said Monday that the bills prospects are "bleak". But the analysis it released Monday evening says "the number of people with comprehensive health insurance that covers high-cost medical events would be reduced by millions" compared with current law.
Other Republicans are wavering, too. "But this bill? It doesn't do that", Klobuchar said. Collins was the third GOP senator to come out against the bill, in addition to Sens.