

President Barack Obama speaks at College Green in Dublin, Ireland, on May 23. Obama opens a six-day European tour with a visit through Ireland, where he will celebrate his own Irish roots. Charles Dharapak/AP
President Barack Obama and first lady Michelle Obama arrive in central Dublin to address thousands of people during their visit to Ireland, on May 23. AP
President Obama shakes hands with a crowd of local residents in his ancestral home in Moneygall, Ireland, on May 23. Larry Downing/Reuters
President Obama walks out of Ollie Hayes pub in Moneygall, Ireland, the ancestral homeland of his great-great-great grandfather, on May 23. Charles Dharapak/AP
Armored presidential sports utility vehicles carrying President Obama and First Lady Michelle Obama drives towards Moneygall, Ireland, on May 23. Charles Dharapak/AP
President Barack Obama and his wife Michelle depart the White House on Marine One helicopter for a visit to Europe, from the White House in Washington, on May 22. Jonathan Ernst /Reuters
A man holds a President Barack Obama souvenir scarf outside a pub in Moneygall, Ireland, on May 21. Obama will visit the village, in which one of his ancestor's lived, during his visit to Ireland. Stefan Wermuth/Reuters
President Barack Obama greets Irish Prime Minister Taoiseach Enda Kenny and his wife Fionnuala, in Farmleigh, Dublin, on May 23. Obama said Monday that the US and Ireland share a 'blood link' that extends beyond strategic interests or foreign policy into the hearts of the millions of Irish Americans who still see a homeland here. AP
A youngster runs past the soon to open Obama Cafe in Moneygall, Ireland, on May 21. Matt Dunham/AP
President Barack Obama reacts after he was presented with a hurley stick from Irish Prime Minister Taoiseach Enda Kenny while in Farmleigh, Dublin, on May 23. AP
A secret service officer cleans President Obama's presidential state car during a visit to Aras an Uachtarain, Dublin, to meet the Irish President Mary Mc Aleese during his 24-hour visit to the Republic of Ireland. Peter Morrison/AP
President Obama and first lady Michelle Obama are greeted by the President of Ireland Mary McAleese and her husband Martin McAleese at the Presidential Residence in Dublin, Ireland, on May 23. Carolyn Kaster/AP
A man carries a shovel to be used for a tree planting by President Obama in Phoenix Park, Dublin, on May 23. Kevin Lamarque/Reuters
President Obama stands with Ireland's President Mary McAleese at the Peace Bell during a tree planting ceremony in Dublin, Ireland, on May 23. Charles Dharapak/AP
Air Force One arrives at Dublin Airport on Monday, May 23. President Obama is due to fly into Britain on Tuesday morning from Ireland for a state visit. Britain's Civil Aviation Authority said it was likely that flights from parts of the country would be disrupted on Tuesday by an ash cloud billowing from a volcano in Iceland. Stefan Wermuth/Reuters
President of Ireland Mary McAleese (l.) and first lady Michelle Obama (r.), watch as US President Barack Obama signs the visitors book at Aras an Uachtarain, the official residence of the President of Ireland in Dublin, on May 23. AP
US first lady Michelle Obama speaks with Fionnuala Kenny (l.), wife of Ireland's Prime Minister Enda Kenny in the gardens of Farmleigh, near Dublin, on May 23. Reuters
Men walk past a house painted with a US flag in Moneygall, Ireland, on May 21. Matt Dunham/AP