Euthanasia is already happening in New Zealand hospitals, according to Prime Minister John Key.
Mr Key has said he "broadly supports" the principle of voluntary euthanasia, and would consider it if he were terminally ill himself.
Labour Party MP Maryan Street's End of Life Choice Bill would legalise euthanasia, and it's created controversy even though it's yet to be drawn from the ballot.
The Prime Minister said he has not read Ms Street's member's bill, so has not completely decided how he would vote if it were drawn.
John Key voted in favour of a similar bill from NZ First MP Peter Brown in 2003.