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UK Labour leader Jeremy Corbyn was the first from the party to be elected using the method, known as Omov.

Both options emerged from a review by former Labour Party Cabinet member Lord Murphy, who was brought in after an outcry from supporters of Omov.

Mr Drakeford, the Cardiff West AM, is the favourite to succeed Mr Jones as leader when he stands down in December, is a leading supporter of Omov.

Prof Drakeford is one of the numerous senior Welsh Government figures who support OMOV, but his rival Mr Gething has said he does not want to see the future system "diminish the voice of the trade union movement, the Co-op Party and our other affiliates".