In this photograph, taken March 6, 1975 by Bruce Dale, President Gerald R. Ford meets with United States Senators and advisors to discuss aid to Cambodia. Senator Hubert H. Humphrey of Minnesota; Senator Clifford P. Case of New Jersey; Senator John Sparkman of Alabama; John Ortho Marsh, Jr., counselor to the president; Max Friedersdorf, White House assistant for Congressional Relations; Lt. Gen. Brent Snowcroft, deputy assistant to the president for National Security Affairs; and William T. Kendall, deputy assistant for Legislative Affairs. Earlier, Humphrey had served as Vice President of the United States under President Lyndon B. Johnson.

This White House photograph of President John F. Kennedy meeting with Ambassador Thomas J. Kiernan of Ireland was taken by Cecil Stoughton on March 17, 1961 in the Oval Office. Ambassador Kiernan presented President Kennedy with an arrangement of shamrocks and a scroll displaying the Kennedy family coat of arms and signed by the chief herald of Ireland, Gerard Slevin.

In this photograph taken by Cecil Stoughton, Ambassador William P. Fay of Ireland presents President Lyndon B. Johnson with an engraved Waterford Crystal bowl filled with shamrocks on March 17, 1965 in the Oval Office. The gift was from the President Eamon de Valera of Ireland on St. Patrick's Day.

This photograph of President John F. Kennedy meeting with Ambassador Thomas J. Kiernan of Ireland was taken by Abbie Rowe on March 17, 1961 in the Oval Office. Ambassador Kiernan is captured presenting President Kennedy with a scroll displaying the Kennedy family coat of arms and signed by the chief herald of Ireland, Gerard Slevin. Kiernan also gave Kennedy an arrangement of shamrocks.

In this photograph, captured from left to right are Irish Minister of Foreign Affairs Garret FitzGerald, President Gerald R. Ford, Taoiseach Liam Cosgrave of Ireland, and Secretary of State Henry Kissinger talking near the fireplace in the Oval Office. David Hume Kennerly took this photo on March 17, 1976, during a State Visit by the taoiseach, or prime minister, and his wife, Vera Cosgrave.

In this photograph, taken March 6, 1975 by Bruce Dale, actor Robert Redford meets with President Gerald R. Ford and his daughter, Susan, in the Oval Office. Redford starred in popular films including "Butch Cassidy and the Sundance Kid" (1969), "The Sting" (1973), and "All the President's Men" (1976). Press secretary Ron Nessen joined the meeting, while chief official White House photographer David Hume Kennerly documented the event.

In this photograph, taken March 6, 1975 by Bruce Dale, President Gerald R. Ford meets with a group of United States Senators and advisors to discuss aid to Cambodia. Present at the meeting were Senator Hubert H. Humphrey of Minnesota; Senator Clifford P. Case of New Jersey; Senator John Sparkman of Alabama; John Ortho Marsh, Jr., counselor to the president; Max Friedersdorf, White House assistant for Congressional Relations; Lt. Gen. Brent Snowcroft, deputy assistant to the president for National Security Affairs; and William T. Kendall, deputy assistant for Legislative Affairs. Earlier, Humphrey had served as Vice President of the United States under President Lyndon B. Johnson. In this photograph, chief official White House photographer David Hume Kennerly can be seen snapping photographs in the background.

In this photograph, taken March 6, 1975 by Bruce Dale, President Gerald R. Ford meets with a group of United States Senators and advisors to discuss aid to Cambodia. Present at the meeting were Senator Hubert H. Humphrey of Minnesota; Senator Clifford P. Case of New Jersey; Senator John Sparkman of Alabama; John Ortho Marsh, Jr., counselor to the president; Max Friedersdorf, White House assistant for Congressional Relations; Lt. Gen. Brent Snowcroft, deputy assistant to the president for National Security Affairs; and William T. Kendall, deputy assistant for Legislative Affairs. Earlier, Humphrey had served as Vice President of the United States under President Lyndon B. Johnson. In this photograph, chief official White House photographer David Hume Kennerly snaps photographs from behind those seated for the meeting.

In this photograph, taken on March 6, 1975, President Gerald R. Ford holds a meeting in the Oval Office with Vice President Nelson A. Rockefeller, cabinet members, and advisors. Joining Ford and Rockefeller at the meeting were James T. Lynn, director of the Office of Management and Budget; Secretary of Agriculture Earl L. Butz; Secretary of Health, Education, and Welfare Caspar W. Weinberger; James M. Cannon III, executive director of the Domestic Council; and deputy assistant Richard B. Cheney. Cheney would go on to serve as Vice President of the United States during the George W. Bush administration.

In this photograph by Oliver F. Atkins, President Richard M. Nixon and American musician Elvis Presley pose for a photo in the Oval Office on December 21, 1970. Out of concern for the country, Presley wrote President Nixon a letter suggesting he be appointed a Federal Agent at Large and requested a meeting. Nixon agreed to meet Presley and, during the visit, gave him a federal narcotics badge. In turn, Presley gifted the president a pistol and some family photos for hosting the meeting.

This photograph of President Richard M. Nixon meeting with American musician Elvis Presley, Delbert "Sonny" West, and Jerry Schilling was taken by Oliver F. Atkins during the president's Oval Office "Open Hour" on December 21, 1970. Out of concern for the country, Presley wrote President Nixon a letter suggesting he be appointed a Federal Agent at Large and requested a meeting. Nixon agreed to meet Presley and, during the visit, gave him a federal narcotics badge. In turn, Presley gifted the president a pistol and some family photos for hosting the meeting.

In this photograph taken by Oliver F. Atkins, President Richard M. Nixon admires a gift given to him by American musician Elvis Presley. Presley gave the gift -- a signed photograph of the Presley family -- to President Nixon during a visit to the Oval Office on December 21, 1970. Also visible is Elvis Presley's collection of law enforcement badges, seen in a small pile on the edge of the Resolute Desk. Out of concern for the country, Presley wrote Nixon a letter suggesting he be appointed a Federal Agent at Large and requested a meeting. Nixon agreed to meet Presley and, during the visit, gave him a federal narcotics badge. In turn, Presley gifted the president a pistol and some family photos for hosting the meeting.

This photograph of President Richard M. Nixon meeting with American musician Elvis Presley in the Oval Office was taken by Oliver F. Atkins on December 21, 1970. White House staff member Egil Krogh is seen looking on at right. Out of concern for the country, Presley wrote President Nixon a letter suggesting he be appointed a Federal Agent at Large and requested a meeting. Nixon agreed to meet Presley and, during the visit, gave him a federal narcotics badge. In turn, Presley gifted the president a pistol and some family photos for hosting the meeting.

This photograph of President Richard M. Nixon meeting with American musician Elvis Presley, Delbert "Sonny" West, and Jerry Schilling was taken by Oliver F. Atkins during the president's Oval Office "Open Hour" on December 21, 1970. Out of concern for the country, Presley wrote President Nixon a letter suggesting he be appointed a Federal Agent at Large and requested a meeting. Nixon agreed to meet Presley and, during the visit, gave him a federal narcotics badge. In turn, Presley gifted the president a pistol and some family photos for hosting the meeting.

This photograph of President Richard M. Nixon meeting with American musician Elvis Presley in the Oval Office was taken by Oliver F. Atkins on December 21, 1970. President Nixon can be seen admiring Presley's cufflinks while White House staff member Egil Krogh is seen looking on at right. Out of concern for the country, Presley wrote President Nixon a letter suggesting he be appointed a Federal Agent at Large and requested a meeting. Nixon agreed to meet Presley and, during the visit, gave him a federal narcotics badge. In turn, Presley gifted the president a pistol and some family photos for hosting the meeting.

In this photograph by Pete Souza, President Barack Obama meets with representatives from FIFA (Federal Internationale de Football Association) on July 27, 2009 in the Oval Office. President of FIFA, Joseph S. "Sepp" Blatter, is seated to President Obama's left and presented Obama with jerseys for his two daughters, Malia and Sasha. Obama welcomed Blatter to the White House to discuss the the United States' bid to host the FIFA Men's World Cup in 2018 or 2022, which would ultimately go to Russia and Qatar.

In this photograph by Oliver F. Atkins, President Richard M. Nixon speaks to Apollo 11 astronauts Neil Armstrong and Edwin "Buzz" Aldrin. The phone call was live on national television as the two astronauts were on the moon and President was in the Oval Office. The phone call was called "the longest-distance phone call ever".

In this photograph, taken by Yoichi R. Okamoto on March 27, 1968, President Lyndon B. Johnson pins a saucer magnolia flower to the lapel of figure skating champion Peggy Fleming in the Oval Office. Johnson plucked the blossom for Fleming from a saucer magnolia tree in the Rose Garden. The 19-year-old figure skater earned a gold medal in the ladies' singles competition at the 1968 Winter Olympic Games in Grenoble, France. President Johnson invited Fleming and her mother Doris to the Oval Office, where he presented the Olympic champion with a gold bangle and pinned the magnolia blossom to her lapel. Later in her career, Fleming headed a figure skating group that performed for President Jimmy Carter during a Christmas party for White House staff on December 22, 1980.

This photograph, taken by Paul Morse, shows President George W. Bush delivering an address to the nation from the Oval Office following the terrorist attacks on September 11, 2001. Bush delivered the live televised address that evening. Contributors to the speech included President Bush; speechwriters John McConnell, David Frum, Matthew Scully, and Michael J. Gerson; national security advisor Condoleezza Rice and her deputy assistant Stephen J. Hadley; and members of the White House communications team. In his remarks, Bush mourned the loss of American citizens yet asserted the strength of the nation, promised retribution for the perpetrators of the attacks and their supporters, and offered words of prayer.

This photograph, taken by Abbie Rowe on April 14, 1961, shows President John F. Kennedy meeting with American athlete Wilma Rudolph in the Oval Office. Rudolph was a triple Olympic gold medalist in track and field during the 1960 Summer Olympics in Rome. She was considered the fastest woman in the world, and at the time of this photograph, was also a student at Tennessee State College in Nashville. Pictured in this photograph from left to right: President Kennedy; Rudolph; Rudolph’s mother Blanche Rudolph; Vice President Lyndon B. Johnson; Robert Logan (standing), a friend of Rudolph's; and Edward Temple, coach of the 1960 women’s Olympic track team.

In this photograph, President Ronald Reagan greets Olympic champion boxer Ray Mercer in the Oval Office. Mercer, along with his teammates from the 1988 U.S. Summer Olympics team, visited the White House on October 24, 1988, following the games held in Seoul, South Korea. Mercer won the gold medal in heavyweight boxing.

In this photograph, President Ronald Reagan greets track and field star Florence Griffith Joyner in the Oval Office. Joyner, along with her teammates from the 1988 U.S. Summer Olympics team, visited the White House on October 24, 1988, following the games held in Seoul, South Korea. Joyner won three gold medals at the games, including the 100 meter and 200 meter sprints.

In this photograph, taken by Pete Souza, President Barack Obama welcomes members of the 2012 U.S. Olympic gymnastics teams to the Oval Office. President Obama welcomed the team members on November 15, 2012. From left to right: Steven Gluckstein, Savannah Vinsant, Aly Raisman, Gabby Douglas, Steve Penny, McKayla Maroney, Kyla Ross, and Jordyn Wieber.

In this photograph, taken by Bill Fitz-Patrick on January 4, 1977, President Gerald R. Ford receives the final report of the President's Commission on Olympic Sports (PCOS) in the Oval Office. President Ford created the commission in response to continuing conflicts among U.S. amateur sports organizations and declining performance by the U.S. in the Olympic games and other international competitions. Pictured with the president in this photograph are Gerald B. Zornow, PCOS chairman and chairman of the board of the Eastman Kodak Company, and Michael T. Harrigan, executive director of the PCOS.

In this photograph, taken on November 15, 2012, President Barack Obama jokingly strikes a pose with Olympic gymnast McKayla Maroney while greeting members of the 2012 United States Olympic gymnastics teams in the Oval Office. The president and Olympic medalist imitate Maroney's "not impressed" expression, which had recently gained popularity as an Internet meme. At the 2012 Summer Olympic Games in London, Great Britain, McKayla earned a gold medal for the women's artistic team all-around competition, as well as a silver medal in the women's vault competition. In this photograph, Steve Penny, president of USA Gymnastics, and Olympic trampoline gymnast Savannah Vinsant can be seen laughing at left.