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Representative Chris Van Hollen, a Democrat from Maryland, right, questions Keith Hall, director of the Congressional Budget Office (CBO), not pictured, during a House Budget Committee hearing with Representative Thomas 'Tom' Price, a Republican from Georgia and chairman of the House Budget Committee, in Washington, D.C, U.S., on Wednesday, June 3, 2015. Hall, a former commissioner of U.S. Bureau of Labor Statistics, began his term on April 1, 2015 replacing CBO Director Douglas Elmendorf. Photographer: Andrew Harrer/Bloomberg via Getty Images

Representative Chris Van Hollen, a Democrat from Maryland, right, questions Keith Hall, director of the Congressional Budget Office (CBO), not pictured, during a House Budget Committee hearing with Representative Thomas 'Tom' Price, a Republican from Georgia and chairman of the House Budget Committee, in Washington, D.C, U.S., on Wednesday, June 3, 2015. Hall, a former commissioner of U.S. Bureau of Labor Statistics, began his term on April 1, 2015 replacing CBO Director Douglas Elmendorf. Photographer: Andrew Harrer/Bloomberg via Getty Images