David Miliband has criticized his brother Ed Miliband's failed campaign to become Britain's prime minister, but says he won't run for Labour Party leader now that his younger brother has stepped down.

David Miliband told the BBC in New York Monday that voters "didn't want what was being offered" by Labour when they gave a majority victory to Prime Minister David Cameron's Conservatives.

David said that his brother Ed allowed himself to be portrayed as "moving backwards from the principles of aspiration and inclusion."

Ed defeated David in a battle for the party leadership in 2010. David later resigned from Parliament to head the International Rescue Committee in New York, and says he remains committed to that job.