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 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.

In this photograph by Pete Souza, President Barack Obama has lunch with Speaker of the House Nancy Pelosi and Taoiseach Brian Cowen of Ireland on March 17, 2009. President Obama and Cowen, the prime minister of Ireland, attended a St. Patrick's Day lunch hosted by Speaker Pelosi in the Rayburn House Office Building of the United States Capitol complex.

In this photograph by Sharon Farmer, President Bill Clinton accepts a gift from Taoiseach Albert Reynolds of Ireland on March 17, 1994. The gift, a crystal bowl of shamrocks, was exchanged in the Roosevelt Room in the West Wing in honor of St. Patrick's Day. Reynolds served as taoiseach, or prime minister, from 1992 through 1994.

In this photograph by Lawrence Jackson, President Barack Obama departs the United States Capitol on March 17, 2015. President Obama attended a St. Patrick's Day lunch at the Capitol alongside Taoiseach Enda Kenny of Ireland, right. Accompanying Obama and Kenny were Representative Peter King, left, and Speaker of the House John Boehner, second from the left. Kenny served as taoiseach, or prime minister, from 2011 to 2017.

In this photograph by Ralph Alswang, President Bill Clinton accepts a gift from Taoiseach John Bruton of Ireland on March 17, 1995. The gift, a crystal bowl of shamrocks, was exchanged in the Roosevelt Room in the West Wing in honor of St. Patrick's Day. Bruton served as taoiseach, or prime minister, from 1994 to 1997.

In this photograph by Pete Souza, President Barack Obama and First Lady Michelle Obama speak with Taoiseach Enda Kenny of Ireland and his wife, Fionnuala Kenny, on March 17, 2011. President and Mrs. Obama welcomed the Kennys in the Green Room of the White House prior to a St. Patrick's Day reception. Kenny was taoiseach, or prime minister, from 2011 to 2017.

In this photograph by Michael Evans, President Ronald Reagan and First Lady Nancy Reagan speak with Taoiseach Charles Haughey of Ireland on March 17, 1982. President and Mrs. Reagan welcomed Haughey in the Red Room of the White House on St. Patrick's Day. Haughey served as taoiseach, or prime minister, three times.

This photograph of chief of protocol Henry Catto, President Gerald R. Ford, and Taoiseach Liam Cosgrave of Ireland in the Yellow Oval Room was taken by Ricardo Thomas on March 17, 1976. The trio met in the Yellow Oval Room, which is located on the Second Floor, prior to a State Dinner held in the taoseach's, or prime minister's, honor.

In this photograph taken by Bill Fitz-Patrick on March 17, 1976, Taoiseach Liam Cosgrave of Ireland, puts a pin on President Gerald R. Ford's lapel. Also pictured in the photograph is chief of protocol Henry Catto, First Lady Betty Ford (with her back to the camera), and the taoiseach's wife, Vera Cosgrave. This moment occurred on the South Drive during the State Arrival Ceremony held in honor of the Taoiseach's, or prime minister's, official State Visit.

In this photograph, President Gerald R. Ford, First Lady Betty Ford, Taoiseach Liam Cosgrave of Ireland, and his wife, Vera Cosgrave, wave from the South Portico. Bill Fitz-Patrick captured this moment during the State Arrival Ceremony held in honor of the taoiseach's, or prime minister's, official State Visit on March 17, 1976.

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.