Enda Kenny's comments come after a new poll shows Enda Kenny and Micheál Martin are neck and neck when it comes to approval ratings.
24% of those surveyed say they would be happy with either as Taoiseach.
The latest IPSOS/MRBI poll – for the Irish Times – was carried out last Friday and Saturday among 1,200 adults at 100 sampling points in all constituencies.
But Enda Kenny says Fianna Fáil can't be trusted.
Meanwhile, Labour Minister Ann Phelan says she was tired and hungry when she stormed out of a local radio debate last night.
Minister Phelan said at the time that she was 'fed up with the lot of ye'.
She said today that she could have handled the situation better.
But Ann Phelan told KCLR that the debate was poorly moderated.