Maori Party co-leader and Waiariki MP Te Ururoa Flavell says sending personnel to train troops in Iraq is effectively the same as sending troops to participate, and would be regarded as an act of aggression by ISIS.
But Mr Flavell said his party understands the desire to assist in the fight in Iraq.
New Zealand will send a non-combat training mission with Australia to Taji Camp, north of Baghdad in Iraq - although it will not be a badged mission, Prime Minister John Key said today.
It would be reviewed after nine months and last no more two years. The total would be up to 143 New Zealand personnel.
Mr Flavell said there was a large scale humanitarian crisis in the Middle East, and New Zealand had much to contribute - but not by sending our own troops.