Taoiseach Micheál Martin will turn his attention to business engagements in Washington DC after a weekend of mostly cultural engagements in Philadelphia.
This morning, he will meet and speak with those from major Irish and American firms.
Mr Martin, Ireland's Ambassador to the US Geraldine Byrne Nason and US Ambassador to Ireland Edward Walsh will attend an Amazon and Enterprise Ireland breakfast event at the Dupont Hotel.
Later, the Taoiseach is expected to give a speech at the St Patrick’s Day Business Leaders Luncheon.
The Taoiseach is also scheduled to take part in a Fox News interview with chief political anchor Bret Baier, as preparations continue for tomorrow’s high profile political meetings with US President Donald Trump and Vice President JD Vance.
Hundreds of guests, including Mr Martin, are due to attend the Ireland Funds National Gala tonight, which will take place at the National Building Museum in Washington DC.
The organisation is celebrating 50 years and 250 years of the relationship between Ireland and the United States.
US Transportation Secretary Sean Duffy will be honoured at the event along with Democratic Whip in the US House of Representatives Katherine Clark.
Mr Martin was cheered at an event yesterday at Ireland's Ambassador to the United States' residence as he congratulated the national rugby team on winning the Six Nations Triple Crown at the weekend.
He said he would add his thanks to England for "doing their very, very best to enable us to win the championship", with reference to their narrow defeat to France, which saw Ireland miss out on the Six Nations title.
Mr Martin arrived in the US capital yesterday evening, where he was marking the contribution of Irish people to the building of the country 250 years on from the signing of the Declaration of Independence and taking part in the Pennsylvanian city's St Patrick's Day parade.
He is set to have a bilateral meeting with Mr Trump and continue the annual tradition of the Taoiseach presenting the US leader with a bowl of shamrocks to mark St Patrick's Day.
Ms Byrne Nason formally introduced the Taoiseach to a packed residence yesterday, with hundreds of guests including Northern Ireland deputy First Minister Emma Little-Pengelly.
Ms Byrne Nason hailed the last two days in Philadelphia with Mr Martin, seeing "more of that green thread woven through the great tapestry of the great United States from the very, very beginning" and the "forever romance between Ireland and the United States".
"It covers our politics, our culture, our history, our business and, most importantly, our peoples, that relationship between the United States and Ireland is enduring," she said.
Read more:
Philadelphia visit frames Taoiseach's message to Trump
More than shamrock on offer for Taoiseach's White House meeting
Mr Martin said celebrating St Patrick's Day across the Atlantic carries particular resonance as the US marks 250 years since the signing of the Declaration of Independence.
He said: "For Ireland the anniversary of the signing of the Declaration of Independence is not simply an American anniversary, it reflects a shared history - Irish men and women were present at the founding of this great Republic.
"They served in American armies, worked in America's cities, contributed to its great debates and helped to inspire its dreams of a brighter tomorrow.
"The Irish helped to build the railroads, schools, churches and the very communities that shaped this great nation, from the earliest days to today, Irish hands and Irish hearts have helped to build America."
He said Ireland's own journey to independence was "inspired by the very noble ideals expressed in the Declaration of Independence".
He added "America played a decisive role in supporting peace and reconciliation on the island of Ireland."
"The Good Friday Agreement stands as one of the great diplomatic achievements of our shared history, shaped and sustained by American engagement," the Taoiseach said.
"The story of Ireland and the United States is not static; it is living, it is evolving, it is being written every day by the people in this room, and as we look forward, we do so with confidence, we look to the next great chapter in the enduring bond between Ireland and the United States," he added.
Ulster Unionist leader Jon Burrows was also among guests.
Northern Ireland First Minister Michelle O'Neill, Sinn Féin president Mary Lou McDonald, Alliance leader Naomi Long and SDLP leader Claire Hanna have said they will not attend events with Mr Trump in the White House this St Patrick's Day as part of a stance against his policies, including in the Middle East.
The Taoiseach has so far stressed the importance of the relationship between Ireland and the US and has highlighted trade and investment between the two nations.
Ireland is now the fifth largest source of foreign direct investment in the US.
Speaking in Philadelphia yesterday, Mr Martin said that Shannon airport is not being used by US planes involved in bombing campaigns in Iran.
He said there had been repeated attempts to conflate Shannon with both the war in Gaza and the current war in Iran, which were absolutely false.
Mr Martin added there were established rules in terms of the utilisation of Irish airspace and insisted that "we haven't had any strong evidence that our airspace is being used for any attacks on Iran".
