Her decision ensures there will be a contest for the post.
Senator Pippa Hackett's confirmed she will run for the leadership of the Green Party.
Her decision ensures there will be a contest for the post, after Integration Minister Roderic O' Gorman announced earlier he would look to become leader.
Both candidates have received the support from a number of TDs.

Kildare TD "Deeply Concerned" About RSA Plans To Install Breathalyser Terminals In Hotel And Pubs
Gardaí Arrest Two Men In Connection With Drug-Related Intimidation
Three People Arrested After Stolen Car Pursuit On M50
Public Sector Talks Begin At WRC Today
Solicitors To Withdraw From All Criminal Defence Work Amid Dispute
Two People Charged In Connection With Fatal Waterford House Fire
Public Sector Strikes Suspended As Government And Unions Prepare For Pay Talks
Gardaí Seize €3M Of Illegal Vapes, Cannabis Products In Carlow And Other Counties