Public Accounts Committee Chairman John McGuinness is to make a statement to the committee tomorrow and answer any questions members may have about recent controversies surrounding him.
He has been criticised for seeking to bring his wife on government trips when a junior minister, and for employing his son in his department.
Mr McGuinness has said he would vacate the chair for the duration of the discussion.
Earlier, Fine Gael TD Simon Harris called into question Fianna Fáil leader Micheál Martin's decision to nominate Mr McGuinness as committee chairman in the first place.
Mr Harris, a member of the committee, said he found it incredible that Mr Martin continued to defend Mr McGuinness in the face of the charges being made against him.
He called on Mr Martin to take the necessary steps to save the committee from any further distraction, embarrassment and damage to its credibility.