Mary Lou McDonald will take part in RTÉ's Prime Time debate tomorrow night, following a decision by the broadcaster to hold a three way leaders debate between Sinn Féin, Fine Gael and Fianna Fáil.
The broadcaster has also decided to invite the leaders of five other parties to a debate on Thursday night.
In making the decision, RTÉ says it's noted a BAI rule which says broadcasters should consider amending their coverage during a campaign, if they feel it's necessary for fairness and impartiality.
Taoiseach Leo Varadkar has welcomed the decision:
"I've always said that it's a matter for the broadcaster and I've always said that I had no objection to including Mary Lou McDonald. I think it's an opportunity for us to scrutinise Sinn Féin's policies a little bit more, and I certaunly I'll be using the debate for that opportunity."