In 2010 , David Walker , former U.S. Comptroller General then working for The Peter G. Peterson Foundation , stated that the CBO estimates are not likely to be accurate .
CBO were based on the assumption that the law would not change .
In 2010 , David Walker , former U.S. Comptroller General then working for The Peter G. Peterson Foundation , stated that the CBO estimates are not likely to be accurate , because they were based on the assumption that the law would not change .