who establishes committees to oversee activities of executive branch
Congressional oversight Congressional oversight is oversight by the United States Congress over the Executive Branch, including the numerous U.S. federal agencies. Congressional oversight includes the review, monitoring, and supervision of federal agencies, programs, activities, and policy implementation.[1] Congress exercises this power largely through its congressional committee system. Oversight also occurs in a wide variety of congressional activities and contexts. These include authorization, appropriations, investigative, and legislative hearings by standing committees; specialized investigations by select committees; and reviews and studies by congressional support agencies and staff.
Cabinet of the United States The heads of the executive departments and all other federal agency heads are nominated by the President and then presented to the Senate for confirmation or rejection by a simple majority (although before the use of the "nuclear option" during the 113th US Congress, they could have been blocked by filibuster, requiring cloture to be invoked by ​3⁄5 supermajority to further consideration). If approved, they receive their commission scroll, are sworn in and then begin their duties.