Support for the two government parties has fallen to its lowest level since the general election.
A new opinion poll, conducted for the Sunday Business Post, shows a combined five-point drop for Fine Gael and Labour compared to one month ago.
The poll was carried out between Monday and Wednesday, at the height of the controversies surrounding the Gardaí and Alan Shatter.
It shows the scandals having a significant impact on Fine Gael, which stands at 26%.
That's the lowest score the party has seen in any poll since the general election, and a fall of three points in the last month.
There is also a blow for Labour, which falls two points to 9%, level with its lowest score since the election in 2011.
Sinn Féin received the benefit of this fall in support for the two Government parties, picking up five points to stand on 21%. Fianna Fáil remain unchanged at 22%.
Independents and others account for the remaining 22% of the vote.