Prime Minister John Key's opening address of the National Party election campaign was disrupted by chanting protesters shouting "stop the war on the poor."
About four protesters chanted as they were escorted out of Auckland's Sky City Convention Centre by police.
They returned to a group of picketers outside the venue, where Mana's Waitakere candidate Sue Bradford was speaking through a megaphone.
As they were being escorted out, Mr Key said "they're welcome to come to our launch because they haven't got one of their own."
At the launch, Mr Key announced that National would put the estimated $5 billion to $7 billion proceeds from partial asset sales into a special fund, the Future Investment Fund.