The Trans Pacific Partnership agreement being negotiated at present would open up New Zealand governments to litigation for tightening regulations in such areas as gas and oil and exploration or even introducing a capital gains tax, according to Professor Jane Kelsey of Auckland University.

She was commenting last night after seeing a chapter on investment, leaked to the Washington based organisation Public Citizen, which has released it.

Both she and the group are strong critics of the trade deal being negotiated by nine countries, including the United States, New Zealand and Australia.

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