A new opinion poll suggests Fianna Fáil has opened up a five-point lead on Fine Gael, while Sinn Féin has lost significant support.
The Sunday Times / Behaviour & Attitudes poll found that support for Fine Gael has dropped by five points to 23% percent, while Fianna Fáil's support remains unchanged at 28%.
It also suggests that support for Sinn Féin has fallen by seven points to 12%, and that follows a two-point drop in the last survey.
The party which has gained most support is the Green Party - which, the poll suggests, now stands 11% - an increase of six points.
The poll also put Labour on 5% support - up one, while the Independent Alliance and the Social Democrats were both unchanged on 3% and 1% respectively.
Solidarity - People Before Profit stand at 2%, down one. Renua are placed at 1% - up one; and Aontu was also placed at 1% - up one.
Independents and others, the poll suggests, stand at 13% - up four.
900 Irish voters participated in the survey between 31 May and 11 June. The margin of error is 3.3%