The Labour Party has tabled a Dáil motion reaffirming confidence in the Mahon tribunal.
The move comes in the wake of a strong attack on the inquiry by the Taoiseach.
In several interviews broadcast and published at the weekend, Mr Ahern claimed the tribunal had not given him a fair hearing during its investigations into his private finances.
He also said the tribunal had failed to act to stop the persistent disclosure of his private documentation by some of those to whom the documents were circulated.
But Labour today insisted the attacks on the tribunal by Mr Ahern and other Government ministers in recent weeks were part of a calculated effort to undermine the inquiry and "intimidate it from discharging the mandate".
Labour deputy leader Joan Burton said: "It is important to restate that the Taoiseach is being treated no differently than any other politician at local or national level against whom an allegation has been made and who was asked by the tribunal to account for large sums of money that came into their possession.
"The tribunal is following the money trail, an approach recommended by the Taoiseach at the time it was established," she added.
The wording of the party's motion insists that the terms of reference of the new tribunal are aimed at following the money trail rather than examining particular allegations so as not to unnecessarily drag in innocent third parties.
It says: "The Government considers that following the money-trail is the most efficient and effective way to progress this type of inquiry as witnessed by the great success of the Dunnes payments tribunal which adopted this approach."
A Labour spokesman said the motion would be debated at the party's next private members' slot when the Dáil resumes at the end of January.
Mr Ahern must return to the tribunal later this year to answer more questions on his personal finances. His recent criticism of the inquiry follows the leaking of confidential correspondence between Mr Ahern's accountants and the Revenue Commissioners.
He is believed to have made a lodgment of slightly less than €70,000 with the Revenue Commissioners to cover any potential tax liabilities.