British Prime Minister Theresa May has declined an invitation to address the Dáil while on a one-day official visit to Ireland.
Taoiseach Enda Kenny invited Mrs May to give a speech to TDs when she visits this month.
She would have been the first Tory leader, and only the second British prime minister, to speak before the Dáil - following on from Tony Blair's ground-breaking address in 1998.
Mr Kenny has indicated that Mrs May turned down the offer, originally advanced by the Ceann Comhairle on a suggestion from the Green Party.
"My understanding is that the Prime Minister's schedule will not allow that to happen and I am not in control of that schedule," Mr Kenny told the Dáil.
"Obviously, when details are absolutely finalised, we will be aware of those.
"My understanding is that the visit was to come to Government Buildings to have a Taoiseach to Prime Minister discussion, and to follow that with a particular set of issues.
"It is around this that the visit will take place."
Mr Kenny and Mrs May are due to meet in Dublin to discuss Brexit.
Green Party leader Eamon Ryan had said it was vitally important that Mrs May sets out her views on how Brexit will affect Ireland during her visit.