United States President John F. Kennedy speaks at the American University commencement in Washington, D.C. on June 10, 1963.
Credit: Arnie Sachs / MediaPunch/IPX
Republicans wave to President Donald Trump at an event to celebrate Congress passing the Tax Cuts and Jobs Act on the South Lawn of the White House on Dec. 20, 2017. Photo by Olivier Douliery/Abaca...