Fianna Fáil has said it will consider disciplinary action against Mary Hanafin, after the former minister ignored party orders not to run in the local elections.
The former minister is running on a Fianna Fáíl ticket in Blackrock, despite three separate rerquests from party leader Micheál Martin to withdraw in favour of a single-candidate policy.
Ms Hanafin was given nomination papers last week when the party was considering a two-candidate strategy.
She ignored a later decision from the party to drop her from the ticket and run only one candidate, and has said she was given no good reason for the change in direction.
In a statement this afternoon, party leader Micheal Martin said his former deputy leader had been given "very clear instructions" not to submit her name.
The matter will now be referred to an internal committee for an investigation and ruling.