This photograph of President Ronald Reagan and Taoiseach Garret Fitzgerald of Ireland was taken by Bill Fitz-Patrick on March 17, 1986. During a ceremony in the Rose Garden, Taoiseach Fitzgerald, also known as a prime minister, presented a Waterford Crystal bowl of shamrocks to President Reagan. Secretary of State George P. Shultz is also pictured.

This White House photograph of President Barack Obama at the Dubliner Irish pub in Washington, D.C. was taken by Pete Souza on March 17, 2012. President Obama visited the Dubliner on St. Patrick's Day with his Irish cousin, Henry Healy (center), and Ollie Hayes, a pub owner from Moneygall, Ireland (right).

This White House photograph of President Barack Obama and Vice President Joseph R. Biden outside the Oval Office was taken by Pete Souza on March 17, 2015. President Obama and Vice President Biden are pictured in festive ties walking to the motorcade on the South Grounds of the White House for departure to the U.S. Capitol in Washington, D.C. for a St. Patrick's Day luncheon.

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 photograph of President Ronald Reagan at the Ireland's Own restaurant in Alexandria, Virginia was taken by Susan Biddle on March 17, 1988. President Reagan is pictured celebrating St. Patrick's Day with the restaurant's owner, Pat Troy.

This photograph of President Ronald Reagan delivering a toast at a St. Patrick's Day luncheon at the United States Capitol was taken by Michael Evans on March 17, 1988. Also pictured are Representative Jim Wright, diplomat Padraic MacKernan, and Senator Edward M. Kennedy.

This photograph of President Ronald Reagan was taken by Pete Souza on March 17, 1988. President Reagan is pictured walking back to the Oval Office on the South Grounds in festive attire following a St. Patrick's Day luncheon at the United States Capitol.

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.

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 close-up photograph of the scroll presented to President John F. Kennedy by Ambassador Thomas J. Kiernan of Ireland was taken by Cecil Stoughton on March 17, 1961. The scroll was signed by the chief herald of Ireland and features the Kennedy family coat of arms. Ambassador Kiernan presented the scroll and an arrangement of shamrocks to President Kennedy in the Oval Office of the White House that St. Patrick's Day.

This White House photograph of President Barack Obama at the Dubliner, an Irish pub in Washington, D.C., was taken by Pete Souza on March 17, 2012. President Obama is shown greeting the crowds on St. Patrick's Day.