Peters voted for then NZ First MP Peter Brown's Death with Dignity Bill in 2003, which was defeated in a conscience vote 60-58 in its first reading. However, NZ First MP Fletcher Tabuteau indicated yesterday the caucus would likely vote against Seymour's bill.
Almost 16 per cent of National's caucus have said they will vote for the bill at first reading - much lower than the 42 per cent of Labour MPs who want to send it to select committee.
The End of Life Choice Bill was pulled from the private members ballot yesterday. It could be debated after the election on September 23.
If passed into law, it would give terminally ill people with six months to live or people with a "grievous and irremediable" condition the choice to ask a doctor to help end their life.
Many of the MPs who have said they will support the legislation stress they are doing so in order for the issue to be examined by select committee.
They include National and Waimakariri MP Matt Doocey, who said he would support it at the first hurdle despite having "real concerns" about the safeguards.
Other undecided MPs, including National and Rotorua MP Todd McClay are considering supporting the bill to select committee, despite being likely to eventually vote against it.
National and Rodney MP Mark Mitchell said he was undecided.
"I'm undecided. I'm going to have a look at it. Normally I like pro-choice. Where you can give people the choice in their life, give it them. This one here, the stakes are so high that I want to be absolutely convinced that if I was going to do that, the proper protections are in place."
His colleague, Chris Bishop, supports the legislation.
"There will be lots of debate inside our caucus, amongst ourselves about the bill. I'll be encouraging them to vote for it but ultimately, for National MPs it's a conscience issue so they'll make their own minds up. And they'll come at it from lots of different perspectives."
Maori Party co-leader Marama Fox said her party was likely to vote against, although she supported the debate on the issue.
"I've sat holding the hands of dying people over and over again ... so I have a good understanding of this and I've never once heard one of those people tell me they want to go early."
A majority of Labour MPs support or are likely to support the bill at first reading, including deputy leader Jacinda Ardern.
Labour and Ikaroa-Rawhiti MP Meka Whaitiri will vote against.
"Culturally, life is important to Maori people. I can not support a bill that will allow a person to end their life."
Adrian Rurawhe, Labour and Te Tai Hauauru MP, will vote yes at first reading.
"I do have some concerns, and I will take it to my electorate and see what their view is. Maori electorates are quite conservative on this issue. But I think it's a discussion that Parliament should consider it."
Labour and Dunedin North MP David Clark will likely vote against, saying a separate inquiry into voluntary euthanasia by Parliament's health committee was "provoking the kind of rich, thoughtful conversation we need to have".
"The bill will not get through before Parliament rises [for the election], and in fact may undermine the very cause Seymour says he is trying to promote."
The Green Party has a formal policy of legalising euthanasia for terminal patients. Health spokeswoman Julie Anne Genter said Seymour's bill went further, and her caucus would need to discuss it before deciding its vote.
How will they vote?
National (58)
YES (9)
Todd Barclay, Clutha-Southland - Yes
Chris Bishop, list - Yes
Matt Doocey, Waimakariri - Yes
Paul Foster-Bell, list - Yes
Brett Hudson, list - Yes
Nikki Kaye, Auckland Central - Yes
Hekia Parata, list - Yes
Jami-Lee Ross, Botany - Yes
Maurice Williamson, Pakuranga - Yes
NO (14)
Maggie Barry, North Shore - No
Chester Borrows, Whanganui - No
Gerry Brownlee, Ilam - No
Sarah Dowie, Invercargill - No
Bill English, list - No
Chris Finlayson, list - No
Todd Muller, Bay of Plenty - No
Jono Naylor, list - No
Simon O'Connor, Tamaki - No
Maureen Pugh, list - No
Shane Reti, Whangarei - No
Alastair Scott, Wairarapa - No
Michael Woodhouse List - No
Jonathan Young, New Plymouth - No
PROBABLY NO (8)
Simon Bridges, Tauranga - Probably No
Jonathan Coleman, Northcote - Probably No
Paul Goldsmith, list - Probably No
Steven Joyce, list - Probably No
Tutehounuku (Nuk) Korako - Probably No
Tim Macindoe, Hamilton West - Probably No
Ian McKelvie, Rangitikei - Probably No
Nick Smith, Nelson - Probably No
UNDECIDED (17)
Kanwaljit Singh Bakshi, list - Undecided
David Bennett, Hamilton East - Undecided
Paula Bennett, Upper Harbour - Undecided
David Carter, list - Undecided
Jacqui Dean, Waitaki - Undecided
Jo Goodhew, Rangitata - Undecided
Barbara Kuriger, Taranaki-King Country - Undecided
Melissa Lee, List - Undecided
Peseta Sam Lotu-Iiga, Maungakiekie - Undecided
Todd McClay, Rotorua - Undecided
Mark Mitchell, Rodney - Undecided
Scott Simpson, Coromandel - Undecided
Stuart Smith, Kaikoura - Undecided
Anne Tolley, East Coast - Undecided
Louise Upston, Taupo - Undecided
Nicky Wagner, Christchurch Central - Undecided
Jian Yang, list - Undecided
NO RESPONSE (9)
Amy Adams, Selwyn - No response
Andrew Bayly, Hunua - No response
Judith Collins, Papakura - No response
Craig Foss, Tukituki - No response
Nathan Guy, Otaki - No response
Joanne Hayes, list - No response
Murray McCully, East Coast Bays - No response
Parmjeet Parmar, list - No response
Lindsay Tisch, Waikato - No response
WON'T SAY (1)
Alfred Ngaro, list - Won't Say
Labour (31)
YES (13)
Jacinda Ardern, Mt Albert - Yes
Clare Curran, Dunedin South - Yes
Kelvin Davis, Te Tai Tokerau - Yes
Ruth Dyson, Port Hills - Yes
Kris Faafoi, Mana - Yes
Iain Lees-Galloway, Palmerston North - Yes
Trevor Mallard, Hutt South - Yes
Sue Moroney, list - Yes
Stuart Nash, Napier - Yes
Grant Robertson, Wellington Central - Yes
Adrian Rurawhe, Te Tai Hauauru - Yes
Louisa Wall, Manurewa - Yes
Megan Woods, Wigram - Yes
PROBABLY YES (4)
Raymond Huo, list - Probably Yes
Andrew Little, list - Probably yes
Poto Williams, Christchurch East - Probably Yes
Michael Wood, Mt Roskill - Probably Yes
NO (2)
Clayton Cosgrove, list - No
Meka Whaitiri, Ikaroa Rawhiti - No
PROBABLY NO (2)
David Clark, Dunedin North - Probably No
Rino Tirikatene, Te Tai Tonga - Probably No
UNDECIDED (4)
Peeni Henare, Tamaki Makaurau - Undecided
Damien O'Connor, West Coast - Undecided
David Parker, list - Undecided
William Sio, Mangere - Undecided
NO RESPONSE (6)
Chris Hipkins, Rimutaka - No response
Annette King, Rongotai - No response
Nanaia Mahuta, Hauraki-Waikato - No response
Carmel Sepuloni, Kelston - No response
Jenny Salesa, Manukau East - No response
Phil Twyford, Te Atatu - No response
Green (14)
YES (1)
David Clendon, list - Yes
PROBABLY YES (5)
Steffan Browning, list - Probably Yes
Barry Coates, list - Probably Yes
Julie Anne Genter, list - Probably Yes
Gareth Hughes, list - Probably Yes
Metiria Turei, list - Probably Yes
UNDECIDED (6)
Catherine Delahunty, list - Undecided
Jan Logie, list - Undecided
Mojo Mathers, list - Undecided
Denise Roche, list - Undecided
Eugenie Sage, list - Undecided
James Shaw, list - Undecided
NO RESPONSE (2)
Marama Davidson, list - No response
Kennedy Graham, list - No response
NZ First (12)
Darroch Ball, list - Undecided
Mahesh Bindra, list - Undecided
Ria Bond, list - Undecided
Ron Mark, list - Undecided
Tracey Martin, list - Undecided
Clayton Mitchell, list - Undecided
Denis O'Rourke, list - Undecided
Pita Paraone, list - Undecided
Winston Peters, Northland - Undecided
Richard Prosser, list - Undecided
Barbara Stewart, list - Undecided
Fletcher Tabuteau, list -Undecided
Maori Party (2)
Te Ururoa Flavell, Waiariki - No
Marama Fox, list - No
United Future (1)
Peter Dunne, Ohariu - Won't Say.
Act Party (1)
David Seymour, Epsom - Yes
