U.S. President Barack Obama (R) meets with visiting Irish Prime Minister Enda Kenny at the Oval Office of the White House in Washington D.C., capital of the United States, March 19, 2013. (Xinhua/Zhang Jun)

U.S. President Barack Obama (R) meets with visiting Irish Prime Minister Enda Kenny at the Oval Office of the White House in Washington D.C., capital of the United States, March 19, 2013. (Xinhua/Zhang Jun)

U.S. President Barack Obama (central R) meets with visiting Irish Prime Minister Enda Kenny at the Oval Office of the White House in Washington D.C., capital of the United States, March 19, 2013. (Xinhua/Zhang Jun)

U.S. President Barack Obama (R) meets with visiting Irish Prime Minister Enda Kenny at the Oval Office of the White House in Washington D.C., capital of the United States, March 19, 2013. (Xinhua/Zhang Jun)

U.S. President Barack Obama (R) meets with visiting Irish Prime Minister Enda Kenny at the Oval Office of the White House in Washington D.C., capital of the United States, March 19, 2013. (Xinhua/Zhang Jun)

U.S. President Barack Obama (central R) meets with visiting Irish Prime Minister Enda Kenny at the Oval Office of the White House in Washington D.C., capital of the United States, March 19, 2013. (Xinhua/Zhang Jun)

U.S. President Barack Obama waves while leaving Capitol Hill after the annual St. Patrick's Day luncheon in Washington D.C., capital of the United States, March 19, 2013. (Xinhua/Zhang Jun)

(L-R) U.S. House Representative Peter King (R-NY), Irish Prime Minister Edna Kenny, U.S. President Barack Obama and House Speaker John Boehner walk out of Capitol Hill after the annual St. Patrick's Day luncheon in Washington D.C., capital of the United States, March 19, 2013. (Xinhua/Zhang Jun)

The limo of U.S. President Barack Obama is seen parked out of Capitol Hill during the annual St. Patrick's Day luncheon in Washington D.C., capital of the United States, March 19, 2013. (Xinhua/Zhang Jun)

(L-R) U.S. House Representative Peter King (R-NY), Irish Prime Minister Edna Kenny, U.S. President Barack Obama and House Speaker John Boehner walk out of Capitol Hill after the annual St. Patrick's Day luncheon in Washington D.C., capital of the United States, March 19, 2013. (Xinhua/Zhang Jun)

(L-R) U.S. House Representative Peter King (R-NY), Irish Prime Minister Edna Kenny, U.S. President Barack Obama and House Speaker John Boehner walk down the steps of Capitol Hill after the annual St. Patrick's Day luncheon in Washington D.C., capital of the United States, March 19, 2013. (Xinhua/Zhang Jun)

(L-R) Irish Prime Minister Edna Kenny, U.S. President Barack Obama and House Speaker John Boehner walk out of Capitol Hill after the annual St. Patrick's Day luncheon in Washington D.C., capital of the United States, March 19, 2013. (Xinhua/Zhang Jun)

(L-R) U.S. House Representative Peter King (R-NY), Irish Prime Minister Edna Kenny, U.S. President Barack Obama and House Speaker John Boehner walk out of Capitol Hill after the annual St. Patrick's Day luncheon in Washington D.C., capital of the United States, March 19, 2013. (Xinhua/Zhang Jun)

U.S. President Barack Obama (L) and House Speaker John Boehner walk down the steps of Capitol Hill after the annual St. Patrick's Day luncheon in Washington D.C., capital of the United States, March 19, 2013. (Xinhua/Zhang Jun)