"Unpacking all the stitching" of the complex deal might not be worth it, says Trade Minister Steven Ciobo.
National hopes the Government welcomes the US with open arms.
President Donald Trump has reportedly told top trade officials to do what they can to get the US back on board.
Deals the Government struck with other signatories will do little, says Jane Kelsey.
New Zealand has signed "don't sue" agreements with five of the CPTPP countries.
Earlier in the day protesters dumped pillows and soft toys outside Jacinda Ardern's office.
The deal will eliminate 98 percent of tariffs in a marketplace worth close to $14 trillion.
Prof Jane Kelsey says there's "nothing progressive" about the deal.
David Parker says the revised trade deal delivers four-and-a-half of Labour's five pre-election pledges.
The controversial treaty is planned to be signed on Thursday, March 8.
Six protesters are locked on the tracks, including the woman who threw a sex toy at Steven Joyce.
Law Professor Jane Kelsey says Labour has squandered its opportunity to show leadership over the Trans-Pacific Partnership agreement.
Her vision is to turn the Greens in a “major broad-based” party.
But New Zealand says the new agreement is now "better than what it was" when the US was involved.
The Trade Minister says it issued five major demands in negotiations.
"There are significant changes," to the document Jacinda Ardern says.
Eleven countries, including New Zealand, are expected to sign a tweaked agreement on March 8