"That process is as much about the living as the dying."

He said Maori voices on the issue were few and far between because of the fear it would be seen as superstition. However, there was a belief euthanasia would leave a soul in limbo rather than return them to the ancestral home.

9:04pm: NZ First MP Tracey Martin said the issue should go to a referendum for the people to decide so NZ First would vote for it at the first reading as a bloc based on a commitment to David Seymour to do so if Seymour also supported the referendum on it.

"Not a single one of us is smarter than the people who placed us here. Not a single one of us has more of a conscience or a right than those who placed us here."

Martin recalled her own father's history with dementia, waking in the night terrified and not knowing who she was or where he was.

"I remember him saying to me 'if I could push a button I would end it now.' Did he mean the dementia or his life? I don't know. For me, this is something I need to grapple with."

She said a wider public discussion was needed.

9:01pm: Labour MP Louisa Wall spoke of the unsuccessful court case taken by Lecretia Seales seeking the right for an assisted death.

"Lecretia's response was 'isn't this my body, my life'? And then she died."

Wall said the judge in that case had said the status quo was not ideal and people were at risk of trying to end their lives themselves – but it was up to Parliament to take any such step.

"A citizen of our country went to the courts for a right and the courts have said she didn't have that right and it was for Parliament to create a mechanism [to deliver that.]"

She said Seales had wanted to live but it had come to a point medicine could not help her anymore.

"This isn't about systemic change, this is about individual choice. And I am standing up for Lecretia."

She said there was no reason the bill could not be fixed in select committee.

8:54pm: National MP Simon O'Connor also opposed the bill, saying it was the worst example of legislation for euthanasia he had seen.

"The current laws as they stand mean nobody will die against their will. But this proposed law will make involuntary dying possible."

He said despite the claimed objections, the law would apply to everyone – the sick, vulnerable, elderly, "the lonely and the fearful."

O'Connor had attacked Labour leader Jacinda Ardern during the election campaign for speaking out against youth suicide while supporting euthanasia. He raised that again in his speech in Parliament, although he did not name Ardern.

"You cannot stand in this House and decry the suicide of one group of people, say the youth, and then encourage the suicide of another group – say the sick."

8:49pm: National leader Bill English was the first opponent to take the stand, saying the bill contained a "cold, bureaucratic process of death" but the price of personal autonomy was not worth the cost to the community.

He said there was a blanket prohibition against taking the life of another in the criminal law but the bill created an exemption to that prohibition which could be decided by "box ticking."

"In removing that prohibition which has been in our law as long as this country has existed, this bill is taking a huge step."

He said many, including himself, had known the suffering and fear of a dying person and those around them.

"Alongside that personal connection, we have to weigh up in our role as lawmakers, not just siblings or children or friends, but as lawmakers.

Our role is to make sure society has a set of laws that protect those that most need protection."

"We don't want people encouraging a depressed or disabled person that their life is not worth something … you are not always the best judge of the value of your life."

He said it would make the disabled and elderly more vulnerable.

He said the price the community would pay was people would be more subject to the pressure to make the judgement that their lives were of less value.

"This bill, with its cold bureaucratic process of death tries to look like it's safe." He said it was not.

8:47pm: Beginning the debate, Seymour said anyone in Parliament could find themselves in the position of having a terminal illness and wishing they had the option to decide when to end their lives.

He said there was a risk of "amateur, violent suicide" and said five per cent of suicides were by people who were dying who wanted to end their life.

"They knew what was coming and wanted to take control."

He mentioned one case of a staffer in Parliament who had unsuccessfully tried to commit suicide after he was diagnosed with Huntington's.

He said the tragedy of that was that that man had tried it years before he would have liked to because he knew he would not have the capacity to do so later.

"That is the moral case for this bill, it is wrong we suffer the status quo when people suffer needlessly."

He said it was an "absurdity" that people did not have that choice at the end of their days.

Seymour also referred to the Supreme Court of Canada, saying it was a conservative court yet the Court had agreed the risks associated with assisted death could be controlled through appropriate safeguards.

He defended the his bill against claims by some MPs that it did not have enough safeguards to prevent the vulnerable being exploited, saying there were numerous thresholds which had to be met before the option became available. Those included age, a requirement to be of sound mind, and suffering from a condition that was terminal or unable to be treated with medical treatment.

They also had to in pain or suffering to a degree that it could not be controlled.

One of the prompts for Seymour to introduce the bill was the campaign of the late Lecretia Seales who died in 2015 after suffering from a brain tumour. Seales had fought for the right for assisted dying, including taking it to the High Court. Her husband Matt Vickers now lives in New York but was back in New Zealand for the first reading, sitting in the public gallery.

It is a conscience vote for all MPs other than NZ First's and Seymour was hopeful he had the support to pass it.

MPs were flooded with emails about the End of Life Choice bill in the past two days, mostly urging them to vote against a law change.

Some of that was driven by anti-euthanasia groups in New Zealand calling on help from their Australian counterparts.

Right to Life Australia had sent out a message to its supporters urging them to make contact with New Zealand MPs.

"Please email MPs in New Zealand urgently today," the email to supporters reads.

It quotes Renee Joubert, executive officer of Euthanasia Free NZ, saying it was crucial that MPs receive thousands of messages in opposition today.

Seymour's bill moved forward on the agenda after Labour withdrew two of its MP's bills because they were no longer required under the new Government and adopted a third as a government bill.

WHAT DOES THE BILL DO?

The End of Life Choice Bill is based on an earlier piece of legislation drafted by former Labour MP Maryan Street.

It would allow mentally competent New Zealand adults with a terminal illness likely to end their life within six months, or a grievous degenerative medical condition which cannot be treated the choice to ask a doctor to help end their life at the time of their choosing. In both cases, the pain or suffering must be unable to be managed through medical care.

The Director-General of Health would establish a group of medical practitioners who would maintain a register of health professionals willing to participate in assisted dying.

A new process would require two medical practitioners to be satisfied a person meets the required criteria. The second would be independent of the patient and initial doctor.