A source close to former primeminister Gordon Brown has revealed that he has asked police if his phone was hacked while he was serving in No10.
It is said that Scotland Yard is yet to get back to Mr Brown with an answer to the question posed several months ago.
The Independent on Sunday has reported that Mr Brown had concerns about the timeframe in which hacking was carried out by a News of the World journalist, who has since been imprisoned.
The new information comes after Downing Street’s director of communications Andy Coulson resigned, after continued allegations about hacking at the paper of which he was editor.
Labour deputy leader Harriet Harman, speaking on Sky News, said: “Hacking into people’s phones is illegal. Obviously the criminal law has got to be complied with and if it is broken then it should be investigated by the police and it should be enforced.
“Nobody is above the law, no newspaper editor, no journalist.”
Suggestions have also been made that Tony Blair had also asked the Metropolitan Police to investigate whether he was a victim of hacking while he was PM, his spokesman said: “Tony Blair did not have a mobile phone as prime minister”
Nick Clegg has denied that the row surrounding Mr Coulson’s departure has been damaging to the government.
Mr Coulson has fully denied any involvement or knowledge of any hacking while he was editor of The News of the World newspaper.
Mr Coulson resigned due to continuing media coverage of the issue “made it difficult for me to give the 110% needed in this role”.
A search for Mr Coulson’s replacement has already begun but questions have been raised by the Labour party at Mr Cameron’s decision to retain the communications director in role while allegations are still being made.
And he defended Mr Cameron’s handling of the issue and his decision to appoint Mr Coulson in the first place after he resigned as editor of the newspaper in 2007.
Mr Clegg has defended Mr Cameron’s handling of the issue and after much criticism of hiring Mr Coulson in the first place after he resigned as editor of the Sunday newspaper in 2007.
“If you listen to what David Cameron has said, he said very emphatically that he thought it was right to give Andy Coulson a second chance.” he told BBC One’s Andrew Marr show.
“Andy Coulson has been very clear that he was not in any way responsible for phone hacking and had no knowledge of it. I have no reason to disbelieve him.”
Nick Clegg has suggested that he will have some input into the selection of Mr Coulson’s replacement.
“It is primarily a decision for the prime minister, he is the prime minister’s spokesman but he is also responsible for communicating government policy so of course I will play a role as well.”
However, Labour said David Cameron could not escape responsibility for bringing Mr Coulson into his top team when there were unresolved questions about his past.
Mr Cameron has come under some criticism from Labour Deputy Leader Harriet Harman for bringing Mr Coulson into such a high-profile position, while there were suspicions of his professional integrity in the past.
“I think that David Cameron was wrong to appoint someone to the heart of the government, to the heart of Downing Street, who had actually been editor of a newspaper at a time when criminal activity was going on,” Ms Harman said.
Harriet Harman has suggested that this issue could risk damaging the public trust in politics further.