Foreign Affairs Minister Murray McCully is calling on Labour's leader to sack his foreign affairs spokesperson if he doesn't apologise for an attack on a government appointee.
Phil Goff raised questions in Parliament on Wednesday about the potential conflict of interest of Peter Kiely, a government-appointed director of Pacific Forum Line shipping.
It emerged on Wednesday that Mr Kiely was a shareholder of the company Sofrana which recently bought New Zealand's 23% share in Pacific Forum Line.
Mr McCully said Mr Kiely's shareholding was as a non-beneficial trusteee and that Mr Goff owed the Auckland lawyer an apology.
He says if he doesn't, Labour leader David Shearer should sack him.
Parliament was told on Thursday that Mr Kiely disclosed that he was a trustee in Sofrana in July this year.
