Rep. Barney Frank (D-Mass.) said that vice presidential nominee Paul Ryan's "lack of specifics" about Mitt Romney's tax plan during Thursday night's debate shows that the numbers don't add up.

"You cannot reduce rates that they're talking about and make that up by closing loopholes without hitting some loopholes that are very popular," Frank told The Huffington Post, citing the mortgage interest deduction and other deductions. "His failure to cite those is an admission there is no real way to do that."