A Fine Gael TD has accused Fianna Fáil of repeatedly making wild calls to increase public spending and urged the party to make a new year’s resolution to fully cost future proposals.
The comments from Longford-Westmeath TD Peter Burke come just weeks after Fianna Fáil pledged to maintain the Confidence and Supply Agreement this year.
The party has described Mr Burke’s statement as a petty political attack.
The last days of 2018 appeared to have delivered medium-term political stability in the Dáil, with Fianna Fáil pledging not to force an election this year.
However, the comments from Mr Burke, who chairs his party’s research unit, indicates a lingering strain between Fine Gael and Fianna Fáil.
Mr Burke said Fianna Fáil had made irrational spending claims throughout last year that totalled €3.5bn.
He claimed the party had no coherent strategy and sought to throw cash at every issue.
Fianna Fáil finance spokesperson Michael McGrath said it was worrying that what he called a "petty party political attack" was launched when the Government should be focused on preparing the country for all Brexit scenarios.
Mr McGrath also accused Fine Gael of writing the script on reckless promises after it vowed to abolish the Universal Social Charge before the last election.