The Republican Party are already in the midst of a civil war over the House Republicans' repeal-and-replace plan for Obamacare, and now it looks like another internal feud is brewing — this one over whether tax cuts should be revenue neutral.

Although the tax reform plan supported by Senate Majority Leader Mitch McConnell of Kentucky and House Speaker Paul Ryan of Wisconsin has the goal of ultimately being revenue-neutral — that is, lowering taxes without increasing the deficit — many Republicans aren't sure they support such an approach, according to The Wall Street Journal.

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Senator Pat Toomey of Pennsylvania told The Journal, "Revenue neutrality shouldn’t necessarily be a constraint. The primary goal should be maximizing growth and thereby increasing the income for Pennsylvania families."

South Carolina Senator Tim Scott took a similar position. "There’s no question in my mind that the growth in the economy will wipe away all fears and concerns. But I’m not sure we have 51 votes for that approach," he told The Journal.

Scott's reference to "the growth in the economy" refers to the concept of dynamic scoring, namely, that the economic growth presumably stimulated by tax cuts will also generate enough tax revenue to at least partially offset any potential deficit caused by the initial tax cuts. The Republican tax plan incorporates dynamic scoring into how it calculates its ultimate budgetary impact.

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Although President Donald Trump has vowed to make sure his $1 trillion infrastructure plan is paid for in a way that is revenue neutral, he has not committed himself to the same approach when it comes to tax reform. Prominent congressional Republicans who have committed to revenue neutral tax reform include Sens. Chuck Grassley of Iowa and Rob Portman of Ohio and Rep. Carlos Curbelo of Florida.