But the controversy has died down since Labour took power and renegotiated the deal in an attempt to, among other things, protect Treaty of Waitangi principles, Pharmac and New Zealand's sovereignty.
During its third reading, Minister of State for Trade and Export Growth Damien O'Connor said the deal would open access for exporters to 480 million consumers across 11 countries, including four which New Zealand had no trade agreement with.
One of those countries is Japan – is the world's third-largest economy.
"New Zealand has valued Japan's leadership in helping to bring this agreement into force.
Our joint efforts to implement the agreement serve as an example of how New Zealand and Japan can work together as strategic partners in our region," Parker said today.
So far, the deal has been ratified by seven of the 11 CPTPP countries – New Zealand, Australia, Canada, Japan, Mexico, Singapore and Vietnam.
Parker said the remaining four signatories were working to complete their domestic procedures and they would soon notify New Zealand, as Depositary, that they are ready to join the agreement.
As well as CPTPP meetings, Parker planned to hold talks with his ministerial counterparts to discuss trade and wider global issues, as well as meeting with New Zealand business representatives.