Sinn Féin leader Mary Lou McDonald has said the Government's Affordable Housing Shared Equity Scheme does not make housing more affordable and will make a bad situation worse.
Ms McDonald said it will maintain unaffordable prices and saddle working people with debt.
"Even the Fine Gael councillors on Dublin City Council have seen sense and come out against this plan," she told the Dáil.
Ms Lou McDonald said with Fianna Fáil back in charge of housing, property developers are back in control and working people will pay the price.
She urged Taoiseach Micheál Martin to ditch the "lame duck" shared equity scheme.
Responding, the Taoiseach said the largest ever house building budget was provided for 2021.
"We have made very rapid progress in terms of housing," he said.
Mr Martin said the Government's only interest was in giving young people the chance to buy a home.
He added that the shared equity scheme was nowhere near as dangerous as Sinn Féin was claiming.