NBC "Meet The Press" host David Gregory, interviewing Sen. Rob Portman (R-OH) on Sunday, said the two co-chairmen of the Simpson-Bowles fiscal commission have told him that Mitt Romney's tax reform proposal doesn't add up.
"Now here's the thing, I know the Romney campaign has six studies that say it does add up but we don't know exactly how. I've talked to Erskine Bowles and Senator [Alan] Simpson of the Simpson-Bowles commission and they say it simply doesn't work -- that either the middle class will have to pay more in taxes or you have to blow up the deficit."
Portman, a top Romney surrogate, insisted the math "does work" but did not specify which tax deductions or credits Romney would target.