Green Party splinter group backs TD's High Court challenge to CETA

Green Party TD Patrick Costello. Picture: Gareth Chaney/Collins

A Green Party splinter group has backed Patrick Costello's High Court challenge to the Comprehensive Economic Trade Agreement.

Green Party TD Patrick Costello lodged the legal challenge against the State on Monday after receiving legal advice that the controversial CETA deal may need a referendum and could be contrary to the Constitution.