The package represents McConnell's attempt to quell criticism by party moderates and conservatives and win the support he needs in a vote he hopes to stage next week.
The former president opened and closed the letter by stressing that the Affordable Care Act - also known as Obamacare - was implemented by his administration not to score political points, but to make people's lives better on both sides of the political spectrum. Federal assistance that helps people afford insurance premiums would be scaled back, and the quality of taxpayer-subsidized insurance plans would decline. Under the senate bill, cost sharing reductions - that help pay for out-of-pocket costs are repealed by 2020. However, the Senate bill changes the Obamacare formula for credits, making them less generous.
While the conservative senators are ultimately expected to vote for the bill, Heller is a much harder no, and if he gets his way, it will be tough to create a compromise that works for the minimum number of Republicans required to pass the bill.
"We have to act", McConnell said.
A day after saying he had "serious concerns" over the Senate's health care reform bill, Sen.
On the other hand, GOP Sens. Yet it still would force those states to figure out what to do about the millions of lower-income Americans who used it to gain health coverage.
The Senate legislation would phase out extra federal money Nevada and 30 other states receive for expanding Medicaid to additional low earners.
Top Senate Democrat Chuck Schumer called the new Bill "heartless", warning it would eventually cut Medicaid even more steeply than the House legislation, which slashes it by US$800 billion (S$1.1 trillion) over a decade. The reductions would hit poor Americans who rely on the government Medicaid program and moderate-income consumers who now qualify for federal subsidies to help them buy private health insurance through the Obamacare marketplace. Each state has expanded Medicaid and has a GOP senator.
And whatever bill they come up with after revisions, would still have to satisfy House Republicans who passed their own version last month - which also appeared less likely to happen on Friday.
That was a reference to other provisions of the Republican plan that would cut taxes by almost $1 trillion over the next decade, mostly for corporations and America's wealthiest families.
"The Senate bill, unveiled today, is not a health care bill", Mr Obama wrote.
Under special rules McConnell is using that will block Democrats from using a filibuster to kill the bill, the legislation can not include provisions that make policy changes that don't primarily affect the budget. But it would also potentially increase turbulence in the health insurance market by allowing healthy customers to pull out and leave only sicker and older customers with coverage plans. He indicated the Senate plan met that request.
He joined four conservative Senate Republicans, Rand Paul (Ky.), Ted Cruz (Texas), Mike Lee (Utah) and Ron Johnson (Wis.), who said Thursday they would not support their chamber's version of the bill because it didn't go far enough repealing Obamacare.