While trying to sell the GOP tax plan as a benefit for the middle class, Rep. Diane Black (R-Tenn.) argued on Monday that it’s hard to tell whether millionaires are in the middle class or are considered “rich.” Fox Business host Trish Regan pressed Black, who chairs the House Budget Committee, about whether the GOP tax plan would actually hurt wealthy taxpayers. She asked how “socking it to the rich”would help Republicans curry favor with the middle class.