Sen. Lindsey Graham said Thursday the Republican Party "fractures" and "financial contributions will stop" if legislators do not pass tax reform.
"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," the South Carolina Republican told NBC News. "Other than that, it'll be fine!"
Graham's response was included in a Twitter post the senator retweeted Thursday.
The Senate introduced its tax plan earlier in the day — and it includes a one-year delay in a corporate tax cut and leaves the mortgage interest deduction intact for American homeowners.
The legislation also would keep seven tax brackets, with the top personal rate being 38.6 percent, and would repeal the state and local tax deduction.
The House version, unveiled last week, was passed Thursday by the Ways and Means Committee.
That plan would lower the number of tax brackets to three, from the current seven, and would impose an immediate reduction in the corporate rate — from 35 percent to 20 percent — and would repeal the state tax deduction.
Last month, Graham said the GOP would lose its "governing majority" in next year's congressional elections — eventually leading to Democratic efforts to impeach President Donald Trump — if it failed on tax reform.
"We'll lose the House, probably lose ground in the Senate," he told Fox Radio host Brian Kilmeade. "President Trump has got a profile different from the party.
"There's kinda two or three different Republican Parties now, I guess, but we're all in it together.
"I can't imagine how he could be successful with Nancy Pelosi running the House," Graham said, referring to the California Democrat and House minority leader.
"They'd try to impeach him pretty quick — and it would be just one constant investigation after another.
"So, it's important that we pass tax reform in a meaningful way," he added. "If we don't, that's probably the end of the Republican Party as we know it."
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