Helen Clark's potential rival for the UN's top job, former Australian Prime Minister Kevin Rudd, has tweeted best wishes to her on the announcement of her candidacy for secretary-General.
"I've worked closely with Helen as PM & at UN. Helen will be a strong UNSG candidate and I wish her well," he said in his tweet.
Mr Rudd, however, has the potential to weaken a Clark bid, either with his own campaign or by not making his intentions clear.
And former New Zealand Prime Minister Sir Geoffrey Palmer said having Australia and New Zealand supporting different candidates would not be a good thing.