Sen. Lindsey Graham Lindsey Olin GrahamGraham: GOP will confirm Trump's Supreme Court nominee before the election Fox's Napolitano: Supreme Court confirmation hearings will be 'World War III of political battles' Grassley, Ernst pledge to 'evaluate' Trump's Supreme Court nominee MORE (R-S.C.) said GOP donors will quit giving to Republicans if Congress does not pass tax reform.

Graham specifically said that "financial contributions will stop" for the GOP.

"The party fractures, most incumbents in 2018 will get a severe primary challenge, a lot of them will probably lose, the base will fracture, the financial contributions will stop, other than that it'll be fine," he said, according to a tweet from an NBC News reporter that was shared by the South Carolina Republican's account.

Q: What happens if GOP isn't able to pass tax reform?



Graham: "The party fractures, most incumbents in 2018 will get a severe primary challenge, a lot of them will probably lose, the base will fracture, the financial contributions will stop, other than that it'll be fine!" — Frank Thorp V (@frankthorp) November 9, 2017

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Republicans in both chambers are marching forward with a tax-reform bill.

A bill unveiled last week by House Republicans would slash the corporate tax rate from 35 percent to 20 percent. It would also reduce most individual tax rates, double the standard deduction and eliminate a number of tax breaks.

The House Ways and Means Committee began marking up the bill on Monday and Speaker Paul Ryan (R-Wis.) has set a Thanksgiving deadline for a floor vote.

Senate Republicans on Thursday are expected to unveil their tax bill, including a detailed proposal but no actual legislative text.

A Morning Consult-Politico poll released Thursday found 45 percent of respondents who are aware of the tax plan support it, compared to 36 percent who are against the tax measure.

This was down slightly from the previous week, when 48 percent of those polled backed it.