The Government came under more pressure today over the Taoiseach's finances after Green Party finance spokesman Senator Dan Boyle criticised Mr Ahern's High Court challenge to the Mahon tribunal.
Speaking on Newstalk radio today, Mr Boyle also said the Taoiseach would soon have to decide on a date for stepping down.
"We're now in a period of time that we have to find out, discover from the Taoiseach himself when he feels his time for leaving within this period of Government is.
"We're probably coming close to a time when his own party colleagues will look for finality on that," he said.
Mr Boyle said as a coalition partner, the Greens would be looking for an indication from Mr Ahern but would have no role in deciding his successor as leader of Fianna Fáil nor of the Government."
The ongoing controversy surrounding Mr Ahern's answers to the tribunal "is not something that's lending towards the proper practice of government" he added.
After the revelation last week that his former partner Celia Larkin received a £30,000 loan in 1993 from his constituency operation and Mr Ahern's use of a political donation of £5,000 in 1994 for personal purposes, Mr Boyle said quesitons were being raised among party supporters about the Greens'aparticipation in Government. "That's an ongoing question."
Mr Boyle also took issue with Mr Ahern's invoking of Dáil privilege in an effort not to answer certain questions before the tribunal. The Taoiseach constitutional challenge will be heard at the High Court on April 1st and could be referred to the Supreme Court which would take a further period of weeks.
Mr Boyle said privilege should not be used as a basis of "not accounting for yourself with the judicial system in our country".
Fine Gael will again hound the Government on Mr Ahern's finances in the Dáil tomorrow.
The Taoiseach will be out of the country and Minister for Finance Brian Cowen will take Leaders' Questions in his absence.
But the main opposition party is keen to highlight Mr Cowen's relatively low profile since Christmas on the Ahern issue.
Mr Kenny said if Mr Cowen supports Mr Ahern, his party would table another motion of no-confidence in the Government.
Tonight Fine Gael's Phil Hogan said he was encouraged that the Green Party seemed to "finding their voice" on the recent revelations.
"This whole spectacle has demeaned politics, has dishonoured the positive contributions Mr Ahern has made and it has destroyed the Government's capacity to do its job on behalf of the public," he said.
"The real issue facing those in Government and in politics generally is, how much longer can this sorry spectacle continue."