An interesting point from Krugman:
Take the CBO estimate of the cost of subsidies and Medicaid expansion in the Senate bill that is, ignoring all possible cost savings. It’s $179 billion in 2018. Take the CMS projection of total health care spending in 2018: it’s more than $4.5 trillion. So the direct cost of expanding coverage the initial bump in the blue curve above is less than 4 percent of total health care spending. That’s the amount by which, on the current trajectory, health spending rises every 7 months.
And it's budgeted. Any Republican who voted for the unfunded Medicare Prescription Drug Entitlement has no logical standing to oppose this bill on fiscal grounds.