Damian McBride has insisted that Labou leader Ed Miliband and shadow Chancellor Ed Balls knew nothing of his toxic briefings against other cabinet members.
He told ITV News' Deputy Political Editor Chris Ship that it "would have taken something of a criminologist" to trace some of the stories he was planting in the press back to him.
He also alleges that Downing Street advisers in "Miliband's camp" briefed against Balls during Gordon Brown's last days as prime minister.
More top news
Tributes are being paid to two young men from Plymouth who died after apparently taking white heroin by mistake in Amsterdam.
One might argue that David Cameron has just given a speech about a problem that doesn't exist and it is definitely one he can't change.
The complex mix of marketing, merchandising and psychology that sees shoppers parting with £360,000 a minute in the UK's shops.