The Labour Party leader, Phil Goff, is embarking upon a 10-day visit to the United States this weekend, where he'll meet with members of the US administration, along with senior trade figures.
Mr Goff will also meet with United Nations officials, American thinktanks and financial institutions.
During his visit, Mr Goff says he'll be supporting progress in Trans-Pacific Partnership Agreement negotiations, and the Doha Round of the world trade talks.
He says he'll work closely with the Trade Minister, Tim Groser, because it's important to demonstrate the strong bi-partisan support that exists for trade policy.
Mr Goff will also visit the former Prime Minister, and his former Labour colleague, Helen Clark, who heads the United Nations' Development Programme.