David Miliband has intervened in the Labour leadership by warning that electing Jeremy Corbyn as leader could lead to one-party rule under the Conservatives.
The former Labour foreign secretary said his party risked creating a multi-party democracy in which only one party could win majorities in Parliament if it chose the hard-left candidate because he would lose even more votes to the Tories and divide the Labour party.
The party should reject the "angry defiance" offered by Mr Corbyn and instead choose the "fresh thinking and political courage of Liz Kendall," Mr Miliband said.
Ed Miliband beat his brother David in an equally-fractious leadership battle in 2010
He is the latest high profile figure of Labour's recent past to speak out against Mr Corbyn, following interventions from Gordon Brown, Tony Blair, Jack Straw and Neil Kinnock.
However his brother, Ed Miliband, is yet to break his silence on the leadership election and he is understood to be planning to keep his counsel on the contest.
Warning of the consequences of a Corbyn victory, David Miliband wrote in the Guardian: "Given the collapse of the Lib Dems, the stakes now are very high indeed, not just for Labour but for the country. Get it wrong, and Britain could become a multiparty democracy with only one party – the Conservative party – that can win parliamentary majorities. A one-governing-party state."
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Explaining his opposition to Mr Corbyn's politics, he said: "The alternative to Syriza/Corbyn is based on passionate reform, not angry defiance.
"Clear-eyed about the dangers of inequality, the corrosion of the public realm, the weakness of international political cooperation relative to economic forces, the necessity of domestic institutional change, it does not seek to fight the next election as a party of angry protest but instead as one of reforming government."
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