Last week, House Speaker Paul Ryan said in a CNBC interview that the distributional analysis of tax plans done by the Tax Policy Center, the Joint Committee on Taxation, and others is based on the “ridiculous notion” that the effect of tax changes on different income groups is important.

Senator Marco Rubio would convert the income tax into a progressive consumption tax, an ambitious idea that would eliminate the income tax’s penalty on saving. However, a new Tax Policy Center analysis finds that Rubio’s version would slash federal tax revenues by $6.8 trillion over the next decade with most of the benefits going to high-income households. Unless Rubio offsets those revenue losses with big spending cuts, he’d lose most if not all of the economic benefit of his plan.

Republican presidential candidate Marco Rubio recently introduced a transportation plan that cuts the federal gas tax 80 percent—from 18.4 cents per gallon to 3.7 cents—and eliminates the Highway Trust Fund’s (HTF) Mass Transit Account.