The opposition has said the Government's plans to ask a barrister to review a dossier of alleged wrongdoing in the Garda is "unbelievable".
The dossier given to Taoiseach Enda Kenny last week is understood to contain a sample of 10 cases including murder which were not properly handled by the Garda.
An official announcement on the appointment of a senior counsel to review the document and advise on the way forward is expected by the Government this afternoon.
Fianna Fail's justice spokesman Niall Collins said: "This latest development is quite simply unbelievable.
"Almost one full week ago the Taoiseach was sent a dossier of some very serious incidents that point to very serious problems with the administration of justice. In the first instance, the Taoiseach acknowledged the gravity of what he had been given.
"Unfortunately, there seems to have been a process of minimisation and misdirection ever since. This has culminated this afternoon in an unbelievably weak response. What is the Government trying to hide?
"The Government's effort seems to have moved from getting to the truth, to establishing a method to avoid a thorough examination. This falls far short of what is needed and will only serve to further undermine public confidence."
The file of allegations is said to involve rogue policing and cover-ups connected to assault, abduction and even murder.
Some of the cases date back to between 2007 and 2009 and it is understood that issues of inadequate policing were first reported by Mr McCabe, a serving garda, five years ago.