The Taoiseach faces Opposition criticism today after his five-hour appearance at the Mahon tribunal yesterday afternoon.
During evidence, the Taoiseach conceded for the first time he may have been among a group of ministers who met the developer Mr Tom Gilmartin in Leinster House in early 1989.
The Fine Gael leader, Mr Enda Kenny, was quick to react last night by saying he was "not surprised by the Taoiseach's admission in Dublin Castle that he may have attended a 'chit-chat' meeting involving Tom Gilmartin.
"The Taoiseach's facility to alter his version of events is well-established. Taken with Senator O'Rourke's evidence it is a further blow to the Taoiseach's credibility and confirms his aversion to frank and truthful answers," Mr Kenny added.
Mr Ahern's evidence gives increased credibility to Mr Gilmartin's insistence that he met seven ministers in February 1989 in relation to his plans for two massive shopping developments in Dublin.
Mr Ahern faced robust cross-examination yesterday during an unprecedented five-hour appearance by a Taoiseach before a tribunal of inquiry and a crowded public gallery. Afterwards, he told journalists he was glad his "long wait" to give evidence was now over.
The Taoiseach agreed that a "chit-chat meeting" could have taken place between some ministers and Mr Gilmartin, although he had no specific recollection of it. However, he repeatedly rejected the characterisation of any such encounter as a "meeting" in the formal sense.
This is a modification of his written statement to the tribunal some months ago that "it is my firm belief that I did not attend such a meeting".
Senator Mary O'Rourke, a former minister, gave evidence on Monday that she witnessed the alleged meeting.