Author Nicky Hager said New Zealand could not go into Iraq with an intelligence role and remain in a non-combat position.
"You can't actually do nation building and solve problems by going into an area and just dropping bombs, and that's what New Zealand is going to be involved in if we have that intelligence role," Mr Hager
"We're going to be trying to solve a problem from 10,000ft with 1000lb bombs or with special forces raiding houses in the night.
We should be laughing at the suggestion, because we've just had a whole decade of experience in Afghanistan and Iraq where that was shown to not work."
said there was "strong diplomatic pressure on New Zealand to follow their Five Eyes partners" into helping Iraq fight Isis.