Gerry Adams has been confronted at a press conference by the son of murdered prison officer Brian Stack - who says he lied to the Dáil.
Austin Stack says the Sinn Féin leader is lying over the source of four names he passed on to the Garda Commissioner earlier this year.
Mr Adams is also facing calls to report the name of an IRA figure, with whom he arranged a meeting for the Stack family.
Our political correspondent Gavan Reilly reports.
