The Fianna Fáil leader has said he doesn't know if a government can be formed by June.
Micheál Martin has said the current situation isn't tenable and a new government needs to be formed.
Fianna Fáil, Fine Gael and the Green Party met last night to start programme for government negotiations.
However, the the Fianna Fáil leader wouldn't be drawn on who would be Taoiseach:
