Pressure is mounting on the new Prime Minister Christopher Luxon to rein in his Deputy Winston Peters - less than one week into the job.

Already the New Zealand First leader and Deputy Prime Minister is at the centre of controversy.

Earlier this week he issued a directive for RNZ and TVNZ to reduce the use of te Reo and claimed the media has been bribed by the previous government.

New Zealand On Air board member, Andrew Shaw, resigned on Tuesday after openly criticising Peters on social media.

Labour leader Chris Hipkins says the Prime Minister has already lost control of his Cabinet.

RNZ Deputy Political Editor Craig McCulloch spoke to Charlotte Cook.