Taoiseach Leo Varadkar received rapturous applause at a private meeting of Fine Gael TDs and Senators in Leinster House tonight when he hit out at Fianna Fáil.
Mr Varadkar accused the party, which underpins his Government, of promising everything to everyone in the country.
He said these promises would cost billions of euro and he is going to keep a record of them all.
Mr Varadkar said what Fianna Fáil is doing has to be highlighted and called out.
And he added that the party would either renege on such promises or actually bankrupt the country again, as they have done in the past.
Fianna Fáil’s finance spokesperson Michael McGrath tonight rejected the Taoiseach's comments, describing them as "political mud slinging".
He said that this party had negotiated two budgets without controversy and was committed to a third one.
Mr McGrath said Fianna Fáil was fiscally responsible, and it had put the rainy day fund on the agenda.
This would act as a buffer in any future downturn and was evidence of lessons having being learned, he said.