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Brit Hume said tax cuts sound very promising to the average voter, but that President Trump may have a harder time selling them to Democratic legislators.

He said Republicans have a very narrow majority in the Senate and must craft the bill well enough that it gets through without too many GOP defections.

"Democrat [legislators] do not favor tax cuts," he said. "They're not that easy to sell."

Hume called it a "mathematical truism" that as the number of taxpayers drops, so do those who benefit from tax cuts.

"Something big must be done because they failed so spectacularly on ObamaCare repeal," he added.

"Broadly speaking, tax cuts are popular [with voters]," he said.

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