Some Republicans are interested in easing the bill's Medicaid cuts and making subsidies for private insurance more generous at low incomes, but the math doesn't add up as long as the bill gives them $700 billion less in revenue to work with than Obamacare.

And some Republican senators have

The point is, you cannot increase the burden on lower-income citizens and lessen the burden on wealthy citizens, Senator Bob Corker, R-Tenn., told NBC News on Thursday. Thats not an equation that works.

Keeping Obamacare's tax on investment income adds $172 billion over 10 years, which is significant. But there's little talk of keeping the taxes on medical companies, which critics say are passed on in higher prices for consumers. Nor is there any indication yet that Republicans are willing to raise taxes elsewhere to make up the income.

That could leave them with the same fundamental problem: Less spending that provides fewer benefits than Obamacare can deliver.

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Here's How the Wealthy Gain From GOP Health Care Bill - NBCNews.com