It was reported this morning that former Northland police officer Mr Sabin is under investigation over an assault complaint.
However, it has also been reported the investigation is being handled by Waitemata police rather than Northland police where it was claimed the events at the centre of the complaint took place.
Mr Key's office this afternoon refused to answer questions on the matter, directing the Herald to police.
However, police were similarly refusing to comment on the matter, saying they did not respond to requests seeking to confirm whether complaints had been made, or if investigations were underway against any individual.
Mr Sabin has so far not responded to requests for comment.
Mr Sabin, 46, has been National's MP for Northland since 2011 when he gave up his anti-methamphetamine consultancy business Methcon, which he formed following his departure from the police in 2006.
- Adam Bennett of the New Zealand Herald
