The former UK foreign secretary David Miliband has criticised his younger brother Ed's performance as leader of Britain's Labour party.
Ed Miliband led Labour to an election loss last week and resigned his post at the head of the party.
Now, David has told the BBC the leadership had allowed itself to be portrayed as "moving backwards".
He says there's "absolutely no point" blaming voters for Labour's defeat.
Mr Miliband had aspired to the Labour leadership himself in 2010 but was beaten to the top post by Ed.
The elder brother says he would not put himself forward to run Labour in opposition, adding he is fully committed to his current responsibilities running an aid agency in New York.
Ed Miliband was widely seen as having steered the party leftwards from the centrist "New Labour" of Tony Blair, who won three elections in a row to be prime minister from 1997 to 2007.
David Miliband, a one-time Blair ally, says his brother allowed himself "to be portrayed as moving backwards from the principles of aspiration and inclusion that are at the absolute heart of any successful progressive political project".
"The answer is not to go back to 1997, it is to build on the achievements and remedy the weaknesses but never to end up in a position where the electorate think you are going backwards rather than addressing the issues of the future," he says.
With AAP.
