Who focuses on how taxpayer dollars are spent in order to help Congress meet its constitutional responsibilities to ensure the accountability of the Government to the American people?

Who focuses on how taxpayer dollars are spent in order to help Congress meet its constitutional responsibilities to ensure the accountability of the Government to the American people? Judicial branch of the Government Agency Inspectors General (IGs) Government Accountability Office (GAO) Both the Government Accountability Office (GAO) and agency Inspectors General (IGs)