Labour Party leader David Shearer has asked the Auditor General to investigate Shane Jones' handling of the citizenship application of Chinese businessman William Yan in 2008 and stood him down while the inquiry takes place.
Mr Shearer wrote to the Auditor General today to ask for an inquiry into the decision Mr Jones made to grant citizenship to Yan, against officials' advice that he should decline it because of questions about Yan's multiple identities and a warrant for his arrest in China.
Mr Shearer said Jones supported the decision to refer it to the Auditor General because it was the only way to clear his name.
"Shane has encouraged me to take this action because he has been left in the impossible position of not being able to clear his name. An inquiry will enable him to do so."
Mr Jones told National Radio he had been involved in the decision to stand him down while the Auditor-General investigated.