The Minister for Communications Denis Naughten is under pressure to spell out a concrete plan to save rural post offices.
An Post said this week that 265 offices across the country may face closure.
However a government-commissioned report by businessman Bobby Kerr has previously indicated that up to 600 post offices are not viable.
Fianna Fáil wants the government to develop a Public Service Obligation model to keep rural post offices open.
Deputy Timmy Dooley says in exchange for State funding, post offices could be harnessed to provide other services