New Zealand First leader Winston Peters avoided stating a preference for who should be the next Prime Minister during last night's political debate - and Conservative leader Colin Craig sought to use that against him.
Mr Craig, who hopes National's John Key will win the election, said it was the biggest point of difference between his party and New Zealand First, which are both gunning for voters with a conservative lean.
Voters deserved to know which way Mr Peters was leaning, Mr Craig said.
Internet Party leader Laila Harre agreed: "It concerns me that Winston is still not making it clear."
Mr Peters, who may hold the balance of power after the election, would say only that the voters will decide the next Prime Minister.
