David Miliband has backed his brother Ed saying he would make a good prime minister - and hinted a return to politics may be on the cards.
The former foreign secretary, who lost out in the party's leadership contest to Ed, said his brother has "the clarity, the vision, the determination" to lead the country.
In an interview with the Financial Times, he said his current job as head of NGO International Rescue Committee could be useful for a political career in the future.
He told the paper: "Tony Blair and John Major have said they wish they'd done their post premiership jobs before they became prime minister."
Ed Miliband has endured an intense bout of speculation about his future recently, with deep unrest among the ranks of backbench MPs and claims that some of his top team are plotting against him.
Last month, Tony Blair said he thought Mr Miliband is ''robust enough'' to deal with the swirling unrest over his leadership, and offered his ''full support''.
Ed Miliband delivered a speech on the public finances today that was short of new policy detail, but marked a change in tone from the Labour leader.
He has committed his party to balancing the book over the course of the next Parliament.
This would mean budgets falling across Whitehall, except in "a limited number of protected departments", Mr Miliband said.
ITV News Political Editor Tom Bradby reports.
Ed Miliband has denied his economic policy speech contained "nothing new" after ITV News Political Editor Tom Bradby questioned the Labour leader.
"I don't agree with that Tom, it won't surprise you to know," Miliband said.
"We're setting out ... what the backdrop will be for a Labour government."
"I'm saying very clearly that outside a limited number of protected departments, budgets will be falling year-on-year until we have the current budget in balance," he added.
Labour leader Ed Miliband has made his first pledge ahead of next year's General Election - to "balance the books".
ITV News Westminster Producer Adam Smith reports:
Ed Miliband has suggested the Conservatives' economic plan will "take Britain back to the 1930s" in a speech setting out Labour's plans to tackle the deficit.
However ITV News Political Editor Tom Bradby is unsure whether the comparison is "useful":
Am not sure this comparison with the 1930s is useful. No, we didn't have the NHS, but we did have an Empire and huge military.
Ed Miliband will pledge to cut public spending to tackle the deficit as he lays out Labour's economic plan.Read the full story ›
Labour leader Ed Miliband took questions from young voters on unemployment, internships, immigration, the NHS and surveillance among many other issues in tonight's Leaders Live.
Watch the highlights from the live Q&A:
Leaders Live: Labour leader Ed Miliband has pledged to lower the voting age to 16 if he is PM after next year's General Election.Read the full story ›
Labour leader Ed Miliband has pledged to lower the voting age to 16 if he is elected at next year's General Election.
Speaking at the Bite the Ballot's Leaders Live season, he promised to introduce legislation in the first session of the next Parliament which would allow 16 and 17 year olds to vote in elections from May 2016.
Mr Miliband said: "That is part of our commitment to hearing the voice of young people."
"I think we need to hear the voice of young people more in our democracy.
"It's a sign of trust in young people".
Leaders Live continues tonight with Labour Party leader Ed Miliband answering your questions on the jobs, health, democracy and immigration.Read the full story ›