He said Friday he would vote against the bill in its current form but did not rule out supporting a revamped, final version of it.
Four conservative senators expressed opposition but openness to talks: Sens.
"I want to see a bill with heart", he said, confirming a switch from his laudatory statements about the House bill at a Rose Garden ceremony with House GOP leaders last month.
"It's significant reform. It's a move in a much better direction because it's a patient-centered move", he said.
"Well, they are also four good guys and they are four friends of mine", said Trump.
One of the most controversial aspects of the senate bill is its treatment of Medicaid.
The Senate health bill keeps much more of Obamacare's core structure than the House version did, making it inherently a more moderate bill - though it still makes massive cuts to Medicaid, a program that covers the nation's most vulnerable.
Other advocacy groups, including the American Medical Association, AARP, the American Hospital Association, the American Academy of Pediatrics and the Association of American Medical Colleges have also criticized the bill.
He called the Senate's bill "not a health care bill" but a "massive transfer of wealth from middle-class and poor families to the richest people in America". That includes phasing out extra money Obama's statute gives states that have expanded the program, a step Nevada has taken, adding 200,000 additional people.
The Senate bill would also erase the tax penalties Obama's 2010 law imposes on people who don't purchase insurance.
Trump said he thinks Republicans in the Senate are doing the best they can to push through the bill.
Sandoval, a Republican who chose to opt into expanding Medicaid, said 210,000 received health coverage because of the decision.
"For immediate stability of the individual market, there are a lot of things in this bill that are really positive", Grow said. Wavering senators should know that we're not fooled. It is, to borrow President Trump's behind the scenes assessment of the House's bill, mean.
A health insurance industry trade group says it's encouraged by provisions of the Senate GOP health care bill, but stopped short of voicing support. The budget office analysis of the Senate measure is expected early next week. Further complicating the issue for him is Nevada's Republican Governor, Brian Sandoval, an outspoken supporter of the Affordable Care Act's Medicaid expansion. Now, the uninsured rate may start climbing again, because both the House and Senate bills cut federal financing and repeal an unpopular requirement to carry health insurance.
More than 200,000 Medicaid recipients in Nevada previous year - more than a third of its entire Medicaid population - were eligible for coverage because of the expansion. University of North Carolina at Chapel Hill Professor Adaora Adimora, a PACHA board member who is still sitting on the counsel, told BuzzFeed News that this bill could be detrimental for all Americans, not just those in the lower class.