During the George W. Bush Administration, the House Committee on Oversight and Government Reform obtained hearing testimony or deposition testimony from White House aides including the White House Director of Security and three former directors of the White House Office of Political Affairs.

During the Clinton Administration, dozens of White House aides provided deposition and hearing testimony to multiple congressional committees, with some individuals testifying repeatedly. One Committee alone, the House Government Reform and Oversight Committee, received testimony from three Chiefs of Staff, four White House Counsels, the Chief of Staff to the First Lady, the Chief of Staff to the Vice President, the Deputy Chief of Staff, the Communications Director, the Special Counsel to the President, the Assistant to the President and Director of Presidential Personnel, the Assistant to the President and Director of Political Affairs, and the Deputy Director and Chief of Staff for Presidential Personnel.

During the Carter Administration, the Senate Judiciary Committee led an inquiry into business dealings between the President’s brother, Billy Carter, and Libyan officials. The Committee inquiry took testimony from White House officials including the National Security Advisor and the Press Secretary. The Committee also reviewed White House telephone records, and a memo to National Security Advisor Brzezinski from his NSC aide Robert Gates on the Billy Carter trip to Libya.

During the Reagan Administration, the joint House and Senate Iran-Contra investigation deposed 290 individuals, over a dozen of whom were current or former Reagan White House officials, including the White House Chief of Staff, Deputy Chief of Staff, and two National Security Advisors, among dozens of other agency officials.

During the Nixon Administration, the Senate Select Committee on Presidential Campaign Activities heard testimony from high-level current and former White House aides including the former Chief of Staff, former Deputy Chief of Staff, former White House Counsel, former Assistant to the President for Domestic Affairs, the Special Counsel to the President, and the Personal Secretary to the President.

House Committee on Government Reform staff report on Oversight of the Clinton Administration:

Congressional Research Service (CRS) report on testimony from presidential advisors