Although there no statements about congressional oversight in the Constitution, the given procedure naturally occurs because Congress possesses all legislative powers. The congressional oversight operates by monitoring and investigating the executive branch on the implementation or the lack of various policies passed by Congress. In addition, it should operate by overviewing the processes of actions, but it should not hinder the policy integration procedure with constant interruptions and reconsiderations.
The US Congress is part of the legislature, including Congressional institutions such as the Government Press Office, the Library of Congress, the Congressional Budget Office, the State Accountability Office, and the Capitol Architect Office. The role of Congress in the system of separation of powers is most fully revealed in those functions that it is vested with under the Constitution. As part of a somewhat simplified scheme, they can be represented in the form of legislation, budget and finances, the formation of the apparatus of executive and judicial power, control over the activities of the government apparatus, the implementation of quasi-judicial functions, and the regulation of intergovernmental relations. To this list should be added those functions that are not reflected in the Constitution but which largely determine the role of the Congress. Representation of parties, social strata and groups, public and professional organizations, participation in the formation of public opinion, and determination of the political line of development can be attributed to such unconstitutional functions. Therefore, the congressional oversight function must operate within the mentioned framework of responsibilities and powers given to Congress.