Executive office of the President : an historical overview ; Emergency powers and executive orders : an introductory overview / Harold C. Relyea -- Direct assaults against Presidents, Presidents-elect, and candidates / Frederick M. Kaiser -- Congressional overrides of presidential vetoes / Gary L. Galemore -- Congressional resolutions on presidential impeachment : a historical overview / Stephen W. Stathis and David C. Huckabee -- Challenges to presidential vetoes / Overview of the presidential pardoning power / T.J. Halstead -- Executive Order 12919 : emergency powers of the President / Robert B. Burdette -- Executive orders : issuance and revocation / Foreign policy roles of the President and Congress / Presidential directives : background and overview / Pocket veto : its current status / Louis Fisher