Prime Minister Jacinda Ardern is on her way to Vietnam where she'll seek to renegotiate parts of the Trans-Pacific Partnership.
Ardern will be attending, but not co-hosting, a meeting with Japanese Prime Minister Shinzo Abe where leaders of the remaining 11 partner nations will be looking to finalise an agreement.
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The New Zealand government is expected to push hard for renegotiation of investor-state dispute settlement clauses which allow foreign investors to sue governments.
But there's fears from Japanese officials, who have been leading negotiations since the US withdrawal earlier this year, that renegotiations could collapse the agreement.