This White House photograph of President Barack Obama and Taoiseach Brian Cowen of Ireland was taken by Lawrence Jackson on March 17, 2009. President Obama and Taoiseach Cowen, also known as a prime minister, are pictured holding a shamrock ceremony in the Roosevelt Room of the White House.

This White House photograph of President Barack Obama delivering a toast during a St. Patrick's Day luncheon at the United States Capitol was taken by Pete Souza on March 17, 2015. President Obama is pictured alongside Taoiseach Enda Kenny of Ireland, also known as the prime minister.

This photograph of President Barack Obama delivering a statement on the death of Osama bin Laden was taken by Pete Souza on May 1, 2011. President Obama spoke live on television from the East Room late on May 1. Bin Laden was the leader of the terrorist group al Qaeda, who were responsible for the September 11, 2001 terrorist attacks on the World Trade Center in New York City, the Pentagon in Arlington, Virginia, and Flight 93, which crashed in Shanksville, Pennsylvania. His death was carried out through a military mission led by members of the United States Navy SEALs.

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 of President Donald Trump delivering his presidential inaugural address was taken during the 58th Presidential Inauguration at the U.S. Capitol Building in Washington, D.C. on January 20, 2017. This photograph was taken by U.S. Marine Corps Lance Cpl. Cristian L. Ricardo for the Department of Defense.

This photograph by Joseph J. Scherschel shows guests, including the recently-nominated United States Ambassador to the United Nations Arthur J. Goldberg, lingering on the South Lawn following President Lyndon B. Johnson's remarks to the 400 delegates of the Status of Women Convention on July 29, 1965. The convention arose from the Presidential Commission on the Status of Women. The commission was created by President John F. Kennedy through an executive order and the first chair was former first lady Eleanor Roosevelt -- her last public position. Following the commission's conclusion, several members went on to found the National Organization for Women.

This photograph by Joseph J. Scherschel shows guests, including the recently-nominated United States Ambassador to the United Nations Arthur J. Goldberg, lingering on the South Lawn following President Lyndon B. Johnson's remarks to the 400 delegates of the Status of Women Convention on July 29, 1965. The convention arose from the Presidential Commission on the Status of Women. The commission was created by President John F. Kennedy through an executive order and the first chair was former first lady Eleanor Roosevelt -- her last public position. Following the commission's conclusion, several members went on to found the National Organization for Women.

This photograph by Joseph J. Scherschel shows guests lingering on the South Lawn following President Lyndon B. Johnson's remarks to the 400 delegates of the Status of Women Convention on July 29, 1965. The convention arose from the Presidential Commission on the Status of Women. The commission was created by President John F. Kennedy through an executive order and the first chair was former first lady Eleanor Roosevelt -- her last public position. Following the commission's conclusion, several members went on to found the National Organization for Women.

This photograph by Joseph J. Scherschel shows guests, including Secretary of State Dean Rusk, lingering on the South Lawn following President Lyndon B. Johnson's remarks to the 400 delegates of the Status of Women Convention on July 29, 1965. The convention arose from the Presidential Commission on the Status of Women. The commission was created by President John F. Kennedy through an executive order and the first chair was former first lady Eleanor Roosevelt -- her last public position. Following the commission's conclusion, several members went on to found the National Organization for Women.

This photograph by Joseph J. Scherschel shows guests lingering on the South Lawn following President Lyndon B. Johnson's remarks to the 400 delegates of the Status of Women Convention on July 29, 1965. The convention arose from the Presidential Commission on the Status of Women. The commission was created by President John F. Kennedy through an executive order and the first chair was former first lady Eleanor Roosevelt -- her last public position. Following the commission's conclusion, several members went on to found the National Organization for Women.

This photograph by Joseph J. Scherschel shows guests, including Secretary of State Dean Rusk and recently-nominated United States Ambassador to the United Nations Arthur J. Goldberg, lingering on the South Lawn following President Lyndon B. Johnson's remarks to the 400 delegates of the Status of Women Convention on July 29, 1965. The convention arose from the Presidential Commission on the Status of Women. The commission was created by President John F. Kennedy through an executive order and the first chair was former first lady Eleanor Roosevelt -- her last public position. Following the commission's conclusion, several members went on to found the National Organization for Women.

This photograph by Joseph J. Scherschel shows guests, including Secretary of State Dean Rusk and recently-nominated United States Ambassador to the United Nations Arthur J. Goldberg, lingering on the South Lawn following President Lyndon B. Johnson's remarks to the 400 delegates of the Status of Women Convention on July 29, 1965. The convention arose from the Presidential Commission on the Status of Women. The commission was created by President John F. Kennedy through an executive order and the first chair was former first lady Eleanor Roosevelt -- her last public position. Following the commission's conclusion, several members went on to found the National Organization for Women.

This photograph by Joseph J. Scherschel shows guests lingering on the South Lawn following President Lyndon B. Johnson's remarks to the 400 delegates of the Status of Women Convention on July 29, 1965. The convention arose from the Presidential Commission on the Status of Women. The commission was created by President John F. Kennedy through an executive order and the first chair was former first lady Eleanor Roosevelt -- her last public position. Following the commission's conclusion, several members went on to found the National Organization for Women.

This photograph by Joseph J. Scherschel shows guests lingering on the South Lawn following President Lyndon B. Johnson's remarks to the 400 delegates of the Status of Women Convention on July 29, 1965. The convention arose from the Presidential Commission on the Status of Women. The commission was created by President John F. Kennedy through an executive order and the first chair was former first lady Eleanor Roosevelt -- her last public position. Following the commission's conclusion, several members went on to found the National Organization for Women.

This photograph by Joseph J. Scherschel shows First Lady Lady Bird Johnson greeting guests on stage during the Status of Women Convention, which arose from the Presidential Commission on the Status of Women. The commission was created by President John F. Kennedy through an executive order and the first chair was former first lady Eleanor Roosevelt -- her last public position. Following the commission's conclusion, several members went on to found the National Organization for Women. President Lyndon B. Johnson spoke to the delegates on the South Lawn of the White House Grounds on July 29, 1965.

This photograph by Joseph J. Scherschel shows President Lyndon B. Johnson and First Lady Lady Bird Johnson listening to remarks delivered to the 400 delegates of the Status of Women Convention, which arose from the Presidential Commission on the Status of Women. The commission was created by President John F. Kennedy through an executive order and the first chair was former first lady Eleanor Roosevelt -- her last public position. Following the commission's conclusion, several members went on to found the National Organization for Women. This event took place on the South Lawn of the White House Grounds on July 29, 1965.

This photograph by Joseph J. Scherschel shows President Lyndon B. Johnson and First Lady Lady Bird Johnson listening to remarks delivered to the 400 delegates of the Status of Women Convention, which arose from the Presidential Commission on the Status of Women. The commission was created by President John F. Kennedy through an executive order and the first chair was former first lady Eleanor Roosevelt -- her last public position. Following the commission's conclusion, several members went on to found the National Organization for Women. This event took place on the South Lawn of the White House Grounds on July 29, 1965.

This photograph by Joseph J. Scherschel shows the crowd gathered to listen to President Lyndon B. Johnson's speech for Status of Women Convention, which arose from the Presidential Commission on the Status of Women. The commission was created by executive order signed by President John F. Kennedy and the first chair was former first lady Eleanor Roosevelt -- her last public position. Following the commission's conclusion, several members went on to found the National Organization for Women. President Johnson's speech took place on the South Lawn of the White House Grounds on July 29, 1965.

This photograph by Joseph J. Scherschel shows the crowd gathered to listen to President Lyndon B. Johnson's speech for Status of Women Convention, which arose from the Presidential Commission on the Status of Women. The commission was created by executive order signed by President John F. Kennedy and the first chair was former first lady Eleanor Roosevelt -- her last public position. Following the commission's conclusion, several members went on to found the National Organization for Women. President Johnson's speech took place on the South Lawn of the White House Grounds on July 29, 1965.

This photograph by Joseph J. Scherschel shows the crowd gathered to listen to President Lyndon B. Johnson's speech for Status of Women Convention, which arose from the Presidential Commission on the Status of Women. The commission was created by executive order signed by President John F. Kennedy and the first chair was former first lady Eleanor Roosevelt -- her last public position. Following the commission's conclusion, several members went on to found the National Organization for Women. President Johnson's speech took place on the South Lawn of the White House Grounds on July 29, 1965.

This photograph by Joseph J. Scherschel shows President Lyndon B. Johnson delivering remarks to the 400 delegates of the Status of Women Convention, which arose from the Presidential Commission on the Status of Women. The commission was created by President John F. Kennedy through an executive order and the first chair was former first lady Eleanor Roosevelt -- her last public position. Following the commission's conclusion, several members went on to found the National Organization for Women. President Johnson's speech took place on the South Lawn of the White House Grounds on July 29, 1965.

This photograph by Joseph J. Scherschel shows President Lyndon B. Johnson delivering remarks to the 400 delegates of the Status of Women Convention, which arose from the Presidential Commission on the Status of Women. The commission was created by President John F. Kennedy through an executive order and the first chair was former first lady Eleanor Roosevelt -- her last public position. Following the commission's conclusion, several members went on to found the National Organization for Women. President Johnson's speech took place on the South Lawn of the White House Grounds on July 29, 1965.

This photograph by Joseph J. Scherschel shows President Lyndon B. Johnson delivering remarks to the 400 delegates of the Status of Women Convention, which arose from the Presidential Commission on the Status of Women. The commission was created by President John F. Kennedy through an executive order and the first chair was former first lady Eleanor Roosevelt -- her last public position. Following the commission's conclusion, several members went on to found the National Organization for Women. President Johnson's speech took place on the South Lawn of the White House Grounds on July 29, 1965.

This photograph by Joseph J. Scherschel shows President Lyndon B. Johnson delivering remarks to the 400 delegates of the Status of Women Convention, which arose from the Presidential Commission on the Status of Women. The commission was created by President John F. Kennedy through an executive order and the first chair was former first lady Eleanor Roosevelt -- her last public position. Following the commission's conclusion, several members went on to found the National Organization for Women. President Johnson's speech took place on the South Lawn of the White House Grounds on July 29, 1965.

This photograph by Joseph J. Scherschel shows President Lyndon B. Johnson delivering remarks to the 400 delegates of the Status of Women Convention, which arose from the Presidential Commission on the Status of Women. The commission was created by President John F. Kennedy through an executive order and the first chair was former first lady Eleanor Roosevelt -- her last public position. Following the commission's conclusion, several members went on to found the National Organization for Women. President Johnson's speech took place on the South Lawn of the White House Grounds on July 29, 1965.