Paul Ryan just undercut a major Republican argument about the GOP tax bill

Alex Wong/Getty Images Paul Ryan said Wednesday that "nobody knows" if the tax bill will pay for itself, after GOP leaders argued for months that it would. Most major analyses show that the bill would not pay for itself. At the outset of the Republican push to overhaul the US tax code,GOP leaders said reform would boost economic growth, help the middle class, and — importantly for the fiscal future of the US — pay for itself. Now, as Congress is on the edge of finally passing the massive tax...