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.

Sharp Rise In M9 Collisions With Garda Call-Outs Up Year-On-Year
Councillor Seeks Clarity On How Often Nightclubs and Late Bars In Naas Are Inspected For Fire Risks
New Figures From CSO Reveal How Much International Protection Applicants Earn Compared To Average Worker In Ireland
Unpaid Eight-Month Work And Training Placement For Adults With Disabilities Branded "Extremely Unfair"
Department Of Education Defends Kildare SNA Cuts Amid Claims Of Reduced Need At Some Schools
Naas Nurses Threaten Escalation As Staffing Row Deepens
Driving Tests Face Disruption As RSA Testers To Strike Next Week
Jury Delivers Not Guilty By Reason Of Insanity Verdict In Ballyfin Demesne Strangling Case