<P> The "necessary and proper" clause of the Constitution also allows Congress to enact laws that mandate oversight by its committees, grant relevant authority to itself and its support agencies, and impose specific obligations on the executive to report to or consult with Congress, and even seek its approval for specific actions . </P> <P> Broad oversight mandates exist for the legislature in several significant statutes . </P> <Ul> <Li> The Legislative Reorganization Act of 1946 (P.L. 79 - 601), for the first time, explicitly called for "legislative oversight" in public law . It directed House and Senate standing committees "to exercise continuous watchfulness" over programs and agencies under their jurisdiction; authorized professional staff for them; and enhanced the powers of the Comptroller General, the head of Congress's investigative and audit arm, the Government Accountability Office (GAO). </Li> <Li> The Legislative Reorganization Act of 1970 (P.L. 91 - 510) authorized each standing committee to "review and study, on a continuing basis, the application, administration and execution" of laws under its jurisdiction; increased the professional staff of committees; expanded the assistance provided by the Congressional Research Service; and strengthened the program evaluation responsibilities of GAO . </Li> <Li> The Congressional Budget Act of 1974 (P.L. 93 - 344) allowed committees to conduct program evaluation themselves or contract out for it; strengthened GAO's role in acquiring fiscal, budgetary, and program - related information; and upgraded GAO's review capabilities . </Li> </Ul> <Li> The Legislative Reorganization Act of 1946 (P.L. 79 - 601), for the first time, explicitly called for "legislative oversight" in public law . It directed House and Senate standing committees "to exercise continuous watchfulness" over programs and agencies under their jurisdiction; authorized professional staff for them; and enhanced the powers of the Comptroller General, the head of Congress's investigative and audit arm, the Government Accountability Office (GAO). </Li>

List three ways congress exercising its oversight power
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