Sinn Fein has declined to say if it has given answers to questions from the Republic's Data Protection Commissioner over its internal database.
The party ignored Press queries yesterday after the Tanaiste Leo Varadkar called on party president Mary Lou McDonald to answer questions about its secret database.
The Republic's Data Protection Commissioner sent the party a list of questions after the Irish Independent reported that Abu, a password-protected website, gave party members access to a database which included the names, addresses and predicted voting intentions of millions of voters.
The website directing members to the database was shut down as a "precautionary security measure" after the party received questions from the commissioner.
Dublin's Minister of State for Local Government Peter Burke said that it is "not acceptable" that the party has not addressed "legitimate" concerns about who created the database.
"Sinn Fein has claimed it is fully compliant with GDPR requirements, so why was the system shut down after the Data Protection Commissioner wrote to the party this week seeking information it is holding on millions of Irish voters?" he asked.
Speaking on RTE's Today with Claire Byrne, the deputy leader of Sinn Fein Pearse Doherty said that it is "nonsense" to suggest the party is "scanning" Facebook to determine how users may vote.
"The idea that Sinn Fein is scanning Facebook for people's comments, that's not what this is, as I said, and that's absolutely nonsense, there is no data harvesting in relation to that going on," said Mr Doherty.
Abu also showed how Sinn Fein believed people previously voted in elections.
Internal Sinn Fein documents also reveal party members are told to elicit information from Facebook users which can be cross-referenced with the Abú system to identify where they live.
Mr Doherty said that Abu is the party's Electoral Register.
"When somebody tells you that they're going to vote for the party then it can be recorded in relation to that."
He said that the database helps Sinn Fein organise lifts for voters to the voting station, if they need them.
"Some person may say that they'll need a lift to the polling station, and therefore you organise a lift for that person and that's what happens in Sinn Fein. It happens in other areas as I said in other parties," he said.
However, Minister Burke asked why the website was shut down.
"If Pearse and his colleagues are so confident that there has been no wrongdoing, why was the database shut down this week?"
He called on Ms McDonald to "end her silence".