Labour's largest affiliated union has sent a warning to leader David Cunliffe not to assume it will back him again if he forces another leadership runoff following Labour's disastrous election result.
Most EPMU delegates voted for Mr Cunliffe in last year's leadership runoff - in which strong support from the party membership and unions carried him over the line. However, the union's general secretary, Bill Newson, said that did not mean Mr Cunliffe would get that support again.
"I've seen comments that the party membership and unions will line up with David Cunliffe. People shouldn't make assumptions based on what happened last time. Because quite a big thing happened in the meantime and it was called an election."
He said the union would discuss its stance once the picture was clearer, and it was still possible delegates would support Mr Cunliffe if there was a contest. It had not made a formal recommendation to its members last time, and only about 35 of its 80 delegates had voted.