Government Minister Meka Whaitiri will stand aside from her portfolios while an investigation is carried out into a staffing matter in her office.
It is understood that Whaitiri has been stood down as the result of an alleged incident during a heated argument with a staff member.
Prime Minister Jacinda Ardern said she had accepted Whaitiri's offer to stand aside while the investigation was done.
While the matter, which has not been disclosed, was being investigated, Kris Faafoi would act as Customs Minister.
Whaitiri's Associate Minister responsibilities in Agriculture, Local Government and Crown/Māori Relations would revert to the lead portfolio ministers.