The report that led to Alan Shatter's resignation will be published later.
The Guerin report runs to 300 pages and looks at how the authorities failed to investigate allegations of garda misconduct.
Senior barrister Sean Guerin was appointed to look into a file of claims made by whistleblower Sergeant Maurice McCabe.
The report due out today led to Alan Shatter's shock resignation on Wednesday and is expected to be explosive.
It deals with allegations that gardai didnt properly investigate crimes - and covers the case of a man who murdered Sylvia Roche Kelly while out on bail for other offences.
The Guerin report also recommends setting up a Commission of Investigation, which the government will announce today.