Support for Sinn Féin has fallen by five points in the latest political opinion poll.
The Red C poll for the Sunday Business Post has the party at 13%, down from 18% in February.
According to the new poll, support for Fine Gael is unchanged at 31% and Fianna Fáil is up one point to 25%.
The Social Democrats, the Independent Alliance and the Green Party all sit on 3%, with Solidarity-People Before Profit on 2%.
Independents and Labour are both unchanged on 15% and 5% respectively, while Renua and Peadar Tóibín's new party Aontú are on less than 1%.
Hugh O'Connell - Political Correspondent with the Sunday Business Post - explained that Sinn Féin was up 5% in their last poll.
He told Newstalk Breakfast: "That had a lot, I think, to do with the coverage [the party] was getting over the no confidence motion in Minister for Health Simon Harris, and the rolling controversy over the overspend in the National Children's Hospital.
"It's dropped back down to 13% in this morning's poll, which is kind of reflective of where it has been at since last November."
The next general election date is expected to be influenced by Brexit, with Fianna Fáil last December extending the confidence and supply arrangement with Fine Gael amid the uncertainy over UK's exit from the EU.
However, Hugh suggested that the upcoming local and European elections will be an opportunity for parties to gauge their support across the country.
He added: "It will be on the basis of those results more than any opinion poll results that will determine when the next election is.
"I don't foresee an election anytime in the next few months, but I think certainly the possibility of an election before the end of this year is a fairly strong one at this stage."
