Fianna Fáil is more popular than Fine Gael for the second month in a row, according to the latest opinion poll.
The Behaviour and Attitudes poll for tomorrow's Sunday Times suggests that support for Fianna Fáil is at 30% - the highest it has been since November 2017.
The poll suggests that the party has a four-point lead over Fine Gael, which it puts at 26%.
Both parties increased their support levels since the same opinion poll last month.
A surge in support for the Green Party - which jumped from 5% to 11% in June - has abated somewhat, dropping four percentage points to 7%.
Sinn Féin has recovered some support, gaining two points to 14%. Support for independents dropped from 13% to 8% in the poll.
There has been little change among the other parties and groups, with support unchanged for Labour at 5%, Solidarity-People Before Profit at 2% and the Social Democrats at 1%.
There have been slight increases for the Independent Alliance, from 3% to 4%; and for both Aontú and Renua, who were on zero in the last poll but scored 1% in tomorrow's poll.
The survey involved face-to-face interviews with 902 people, in all constituencies, between 4 July and 16 July.
The margin of error is 3.3%.