Support for Fine Gael has fallen in the first weeks of the year, according to the latest Sunday Times/Behaviour and Attitudes opinion poll.
The survey of voters suggests Fianna Fáil is the most popular party and there were also gains for Independents and the AAA-PBP group.
The Taoiseach insisted this week that there was no prospect of an election this year. But if there was one held now - his party would win 23% support, according to this poll.
That is a drop of three points compared to last month and also below its general election showing.
Fianna Fáil is up one point to 29% and it now has a six-point lead over the party whose Government it is underpinning.
Sinn Féin is down two points and its support now stands at 17%.
The biggest movers in this poll are the non-aligned independents, up six points to 15%.
Support for the Independent Alliance TDs in Government fell by two points to stand at 3%.
Both the Labour Party and the AAA-PBP group are each on 5% support.
The Greens are on 3% and the Social Democrats are on 1%.
This poll was taken over a fortnight up to last Monday and the margin of error is 3.3%.