The Sinn Fein leader says Commissioner Phil Hogan's position is untenable.
It comes as a spokesperson for the President of the European Commission says the decision on his future will be fair.
Since the publication of his time line of his activities yesterday, Ursula von der Leyen spoke again with Commissioner Hogan.
Taoiseach Micheál Martin says he has undermined public health guidelines and the changing narrative in the story has been a challenge.
Sinn Féin Leader Mary Lou McDonald says it's not plausible that having lost the confidence of those who appointed him that he would continue in his position.