Micheál Martin, Leo Varadkar and Mary Lou McDonald have taken part in their last televised leaders' debate ahead of Saturday's general election.
The RTÉ Prime Time debate had originally only been set to include the Fine Gael and Fianna Fáil leaders - but Ms McDonald was invited amid Sinn Féin's surge in the polls.
During the debate, the Sinn Féin leader refused to answer whether she supports the Special Criminal Courts - with Mr Varadkar claiming she "doesn't want you to hear the answer".
Mary Lou McDonald also came in for criticism over party member Conor Murphy's comments about the 2007 murder of Paul Quinn.
When the comments were read out to her, she responded: "My recollection was that he had not been as explicit as that. The remarks were wrong - they're withdrawn, correctly, and will be apologised for."
Ms McDonald got on the front foot, however, while criticising the policies of the two other parties.
On the housing situation, she suggested: "The reality is each in their individual ways... have created this crisis.
"Fianna Fáil was and is the party of property developers, and Fine Gael is the party of landlords."
The debate also saw Taoiseach Leo Varadkar sharply criticise Fianna Fáil's record in government.
He claimed: "Putting Micheál Martin and Fianna Fáil back in charge of our economy would be like asking John Delaney to take over the FAI again in nine years' time."
Mr Martin, meanwhile, dismissed any suggestions he has been in government for the last four years as "the big lie of the campaign" - noting that they have had no ministers.
He also suggested Sinn Féin's manifesto figures had been "magiced up" and "do not add up".
'Thirst for change'
Mr Varadkar opened the debate by conceding the same government will not be elected, but appealed for Fine Gael to still lead the next one - citing economic and Brexit messages.
He said his party wants change for the better, suggesting that this is not Fianna Fáil's change.
Mr Martin, meanwhile, insisted he has "managed to bring about great change".
He said his party wants to see real, immediate and urgent change - referring to the health sector and hospitals.
Ms McDonald suggested: "It is right to say the theme of this election has emerged as a thirst for change.
"People have said to me that they recognise that Fianna Fáil and Fine Gael - essentially identical parties - have had it all their own way now for almost a century".
"People increasingly recognise Sinn Féin as an alternative."
Mr Varadkar then attacked Sinn Féin on their past and present - while Mr Martin said Sinn Féin's climate change policy is "akin to climate denial".
Ms MsDonald was pressed several times on Sinn Féin support for the Special Criminal Court.
Without giving a solid answer, she said that "I support the courts" and wanted a review of them.
