The prospect of merging Wales' four police forces into a single mega-force has resurfaced, as politicians scrambled to respond to reports of an overhaul of policing in the new year.
Adam Price raised reports that Home Secretary Shabana Mahmood is considering cutting the number of police forces in Wales and England from 43 to 12 through mergers.
The former Plaid Cymru leader told Senedd members the reforms would represent the "biggest upheaval" of police forces since the 1960s.
Warning the Welsh Government was not consulted on plans to scrap police and crime commissioners, he said: "No change should happen – a merger for example – without full Senedd scrutiny and a Welsh democratic mandate."
Mr Price suggested an all-Wales model – merging the four police forces, similar to what happened in Scotland in 2013 – could have benefits but said governance would be critical.
'Unconfirmed'
During Wednesday's topical questions, he argued a single police force would need to be accountable to the Senedd, with powers over policing devolved to Wales.
The MP-turned-Senedd member urged the UK Government to rule out any cross-border mergers involving a Welsh force being absorbed into an English one.

Responding for the Welsh Government, Jane Hutt described the widespread media reports as "unhelpful, unconfirmed speculation", but she confirmed the UK Government is expected to publish a white paper in the new year.
The social justice secretary committed to engaging with Sarah Jones, the UK policing minister, who was attending a meeting of the Welsh policing partnership board on Thursday.
Ms Hutt told the Senedd she has been assured the UK Government recognises the differing governance arrangements between Wales and England.
'Dysfunctional'
Conservative Altaf Hussain urged the Welsh Government to take the opportunity to abandon calls for devolving powers over policing and justice to Wales.
Dr Hussain said: "There is merit in having a single unified police force for England and Wales – if only to tackle dysfunctional forces like Gwent Police, who have allowed a culture of misogyny to persist amongst their officers and leaders."
Ms Hutt suggested reforms would present a natural opportunity to consider the role of the Welsh Government and Senedd in terms of accountability for policing in Wales. She said the focus is on a phased approach, beginning with powers over youth justice and probation.
Jane Dodds, the Liberal Democrats' leader in Wales, called for a clear timetable for the devolution of youth justice and probation. "We need more devolved powers," she said.
Labour's Alun Davies agreed, accusing UK ministers of putting Ms Hutt in an "invidious position" of responding to hearsay about a fundamental public service. He said: "This is the second time in two months...this simply isn't good enough."
'Groundhog day'
Mr Davies criticised Labour colleagues in the UK Government for "clearly" not recognising calls for policing to be devolved and biting the bullet. "That needs to happen," he said, adding: "It needs to happen as soon as possible."
The former minister told the Senedd: "We certainly don't want to see the nationalisation of policing that's just been proposed by the Conservatives. We've never had a national police force in the UK – we don't want one today."
It was "groundhog day" for the Conservatives' Mark Isherwood who reminded the chamber of the then-Assembly's review of policing in 2005 when mergers were floated previously.
He said: "To recognise the regional cultural and geographical differences that exist within Wales, all agreed that Wales must be policed in regions."
But Rhys ab Owen, who sits as an independent, argued Wales' four police forces "make no sense at all" with Police Scotland showing a unified force can "flourish".

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