Green co-leader James Shaw has told supporters that they can't always get what they want as the party comes under fire from some supporters. 

High ranking Green Party member Jack McDonald, the party's policy co-convenor, is stepping down ahead of next year's election. In a Twitter post, he made the decision because of the party's centrist drift under James Shaw.

He says we don't have time for centrism or moderation. He also cited his disappointment at Metiria Turei's resignation in 2017.

McDonald also ran on the party's list in last election, but will not be seeking re-election.

Excited to be at the Green Party AGM in Dunedin this weekend. I announced I won't be standing for re-election to the leadership position of Policy Co-convenor. I've also decided that I won't be standing as the Greens' candidate for Te Tai Hauāuru in next years' general election. pic.twitter.com/KDfhKoB17J

— Jack McDonald (@tautokai) August 2, 2019

Shaw told the Weekend Collective it's what happens in a MMP government.

"This is always going to be part of the transition from being a party of opposition into a party of government, especially when you make up one of three parties. You're not always going to get everything that you want."

The controversy has overshadowed the party's latest announcement at their annual conference in Dunedin. The Greens announced that they are ready to negotiate a rent-to-own policy as part of the Government’s KiwiBuild reset.

Co-leader Marama Davidson says it's about giving people a secure home of their own and a sense of belonging in a community.

Other proposed reforms include changes to the Residential Tenancies Act, and a mandatory warrant of fitness to enforce proper standards.