Questions are being asked about Stephen Donnelly's role as a landlord and a senior minister at Cabinet.
The Health Minister will brief the media this morning after it emerged he failed to renew a registration with the Residential Tenancies Board.
He has been backed by the Taoiseach but it comes just days after Robert Troy was forced to resign following his own property controversy.
Sinn Fein's Martin Kenny says it's not a good look when politicians are not following their own rules.
"I hope that lessons will be learned from all of this, and that all TDs and Senators and elected reps recognise that we can't be the people that are making the rules and at the same time being in breach of them.
"He will probably rectify the situation I think, and back date the registration."