Former Green Party senator Dan Boyle has said questions need to be answered about the signing of the bank guarantee in 2008.
Last weekend it emerged the Public Accounts Committee is to submit detailed plans for an investigation into the banking collapse to the Minister for Public Expenditure and Reform Brendan Howlin in the coming weeks.
The inquiry would compel former Taoiseach Brian Cowen, as well as ex-bank bosses Eugene Sheehy and Brian Goggin, to reveal their role in the night of the bank guarantee in September 2008.
Senator Boyle, who was Green Party spokesperson on finance at the time, has said everyone involved has questions to answer:
"I think anyone in the process has questions to answer. There are questions about the quality of decision-making in the civil service as well as the political decision-making.
"We know that because of the lack of regulation that was going on at the time.
"In any case, I think a lot of what is going on is a very cynical exercise and a political smokescreen. By all means have the investigation, try to find out information and try to get lessons for the future but don't pretend this is the source of all our problems."