The announcement was made last night.
The Taoiseach's paid tribute to Heather Humphreys, who's confirmed she won't seek re-election at the next General Election.
Simon Harris says she's been a 'trailblazer in Irish politics' - a great friend - and a dedicated Minister, and Deputy Leader of the party.
The surprise announcement last night brings the exodus of Fine Gael TDs to 18.
Our Political Correspondent Sean Defoe says it’s a headache for Simon Harris.