Fianna Fáil is making an attempt to invite the Attorney General into the Seanad to speak on the Fennelly report.
The party is invoking Standing Order 56 of the Seanad rules which says that an Attorney General may be heard in the upper house.
A vote on whether such an invitation may be extended will take place at around 5pm.
Fianna Fáil leader in the Seanad, Darragh O'Brien, says Máire Whelan needs to be heard.
He said: "She herself will have a unique and important perspective on what really happened around that time.
"I do believe that it would be important that she answer questions around some of the contradictory evidence that was given and the fact that her evidence had to be changed four times during the course of that commission."