Alastair Campbell has called the Prime Minister's stance on the TV leaders' debates "morally cowardly and democratically wrong".
Labour's former director of communications wrote on his blog: "How well I remember David Cameron proclaiming how marvellous the TV leaders' debates were and, more importantly, how vital they were to the democratic process in the modern media age.
"And how pathetic it is, five years on, to watch his wriggling and weaselling to avoid them.
"If Ed Miliband is as hopeless as Cameron and his press poodles say he is, why is the Tory leader so scared of going head-to-head over an extended period live on TV?"
David Cameron has damaged his reputation by trying to avoid TV debates with other leaders, according to a new ComRes poll for ITV News.
Ed Miliband say a Labour government would take legal steps to make sure leaders' debates a permanent feature in general election campaigns
Former Conservative Party chairman suggests a Tory-Labour grand coalition to stop the SNP holding the balance of power at Westminster.