The US Ambassador to Ireland has said "no members of Sinn Féin have been invited to the White House" and "none are expecting to be invited".
Sinn Féin politicians had confirmed they would not attend St Patrick's Day events in Washington, due to the Trump's administration's support of Israel during its war in Gaza.
However, in a statement to RTÉ News, Edward Walsh said: "Announcing a boycott of an event for which invitations have neither been extended nor finalised is premature."
Mr Walsh said St Patick's Day in Washington "celebrates the enduring strength of the modern US–Ireland relationship.
"It is more than a tradition. It is a uniquely powerful opportunity to engage directly with the President and senior leadership of the United States.
"Demand to participate this year is the strongest we have ever seen, underscoring the depth and vitality of the US-Ireland partnership."
Mr Walsh added that leaders, business figures and community representatives are "eager to be part of that engagement and to strengthen the bonds between our nations, and those are the people who will be there".
He said it was "regrettable that Sinn Féin has chosen to step back from that opportunity".
"We will continue working closely with leaders in both the Republic of Ireland and Northern Ireland who are committed to peace, prosperity, constructive partnership, and the enduring friendship between our nations," Mr Walsh said.
Responding to the US Ambassador's comments, Sinn Féin TD Pearse Doherty said: "Invites are issued closer to the event."
He added: "That's the way it's been for decades in relation to the visits.
"We're very clear, and we've made it very clear to our supporters, to the Irish people, and indeed to the US administration, that we will not be attending the US events in St Patrick's Day.
"The reason being is because the US is complicit in relation to the genocide that has happened in Palestine, and we stand four-square with the people of Palestine on this occasion."
Mr Doherty said: "You only get the invitation days before the event.
"We have made it clear to them that we are will not be participating in the event as a result of our principled stance in relation to what's happening and what America is facilitating in relation to the genocide.
"We'll continue to build US-Ireland links. We will have members in the States on many occasions between now and the end of the year.
"We'll continue to foster links and all the rest."
However, the Donegal TD said it is "different to actually participate in events which actually gives succour to the administration in relation to what is absolutely deplorable, a genocide right before our very eyes".
He said the comments made by the Trump administration are not acceptable.
