"And that is, what does it actually mean, applying this notion of giving someone else the right to end the life of my family member, my wife if she gets a terminal illness, my mum, others.

"If this legislation passes, and I get it wrong, or we get it wrong in relation to a diagnosis, what number is a number that is acceptable for you for us to get this wrong, for us to make one mistake at the end of life and we'll never get that time back again."

The bill does not required the doctors signing off on a death to be specialists in the disease from which a terminal patient is dying.

"I'm telling you right now, when it comes to a choice and that is a choice to end the life of a loved one, in the hands of someone else, one [wrongful death] is too many," Mr Hammond said.

"My mum is too many. For me, it just will never be a 'yes' and I would urge those who are making these decisions to join me in saying this bill is not OK."