Sen. Rand Paul on Monday angrily rebuked congressional Republicans' tax reform plan for providing a tax cut that he said would only benefit about 30 percent of middle class Americans.

This is a GOP tax plan? Possibly 30% of middle class gets a tax hike? I hope the final details are better than this. https://t.co/lcjkI4YRz8 — Senator Rand Paul (@RandPaul) October 2, 2017

Republicans can only afford to lose three votes on tax reform, Axios reported, and retiring Sen. Bob Corker, R-Tenn., on Sunday told Meet The Press he won't support the tax bill if it adds to the deficit.

Paul's displeasure adds to the pressure on Senate Majority Leader Mitch McConnell, R-Ky., to deliver a final bill acceptable to his members, Axios reported.