The process around the Trans-Pacific Partnership Agreement is coming under judicial review in the High Court today.
University of Auckland Professor Jane Kelsey made a request under the Official Information Act in January this year, but it was refused.
She said it's her understanding Trade Minister Tim Groser's refusal to be transparent about the TPPA goes against the Act.
Professor Kelsey hopes that by having a judicial review, it will remove some of the secrecy around not only the TPPA, but future trade deals and agreements.
"Ministers and governments increasingly hide behind rights to withhold information and there hasn't been an effective judicial review of that for a very long time."
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