White House budget chief Peter Orszag said that CBO’s long-range economic projections are more pessimistic than those of the White House, private economists and the Federal Reserve and that he remained confident that Obama’s budget, if enacted, would produce smaller deficits.

Even so, Orszag acknowledged that if the CBO projections prove accurate, Obama’s budget would produce deficits that could not be sustained.

“Deficits in the, let’s say, 5 percent of GDP range would lead to rising debt-to-GDP ratios that would ultimately not be sustainable,” Orszag told reporters.