Richard Nixon's presidential portrait. Retouch has not been completed yet.

Cropped portrait of Richard Nixon.

Presidents Gerald Ford, Richard Nixon, George Herbert Walker Bush, Ronald Reagan and Jimmy Carter at the dedication of the Reagan Presidential Library (Left to right).

Former President Richard Nixon, head-and-shoulders portrait, facing right, standing in front of photographs of presidents in Representative William Broomfield's congressional office

President William J. Clinton greets President Richard Nixon in the State Dinning Room. Photographer: Robert McNeely

Protest at the White House the day after the firing of James Comey

Richard Nixon

President Richard Nixon, head-and-shoulders portrait, facing right, standing in front of photographs of presidents in Representative William Broomfield's congressional office

Elvis Presley meeting Richard Nixon. On December 21, 1970, at his own request, Presley met then-President Richard Nixon in the Oval Office of The White House. Elvis is on the right. Waggishly, this picture is said to be 'of the two greatest recording artists of the 20th century'. The Nixon Library & Birthplace sells a number of souvenir items with this photo and the caption, "The President & the King."

Mexican president Gustavo Díaz Ordaz (left) and U.S. President Richard Nixon (right) riding a presidential motorcade in San Diego, California, USA.