
In this April 13, 2010 file photo, Andy Coulson, the ruling Conservative Party's Director of Communications speaks on the phone in London, England. Coulson quit as Downing Street communications chief Friday Jan. 21, 2011, saying the continuing row over phone-hacking when he was editor of the News of the World newspaper was distracting from his job.
Andy Coulson denies any knowledge of the hacking, but admitted he'd committed a cardinal sin for a back room operator - he became the story.
Coulson said "continued coverage of events connected to my old job at the News of the World has made it difficult for me to give the 110 percent needed" in his role as Downing Street communications chief.
"I stand by what I've said about those events but when the spokesman needs a spokesman, it's time to move on."
A reporter and a private investigator working for the News of the World were caught illegally eavesdropping on the phones of the British royal family's entourage in 2007. Coulson quit the paper when the pair were convicted, but says he knew nothing of the hacking.
His resignation is a blow to Prime Minister David Cameron, who has resisted calls to fire Coulson despite the scandal.