Tom Watson has called for an investigation into the Sun newspaper to see if it had any kind of involvement with illegal phone-hacking activities which resulted in the closure of its sister paper, the News of the World.
The Sun is another paper owned by media tycoon, Rupert Murdoch and its editor, Dominic Mohan, has also previously worked for the News of the World. Mohan took over as editor of the Sun in 2009.
According to Tom Watson, Mohan used to joke about poor security at mobile phone provider, Vodafone when he was working at the NOTW.
During an emergency debate which took place at the Labour Party Conference in Liverpool, Mr Watson said "Do you really think hacking only happened on the News of the World? Ask the editor of The Sun if he thinks Rupert Murdoch's contagion has spread to other newspapers."
The former chief executive of News International, Rebekah Brooks has insisted that the Sun was a "clean ship" when she was editor before Dominic Mohan took over her duties.
However actor Jude Law has filed a complaint against the Sun for four articles which were published between 2005 and 2006. He believes that the information contained in the articles could not have been obtained without his phone being hacked. Law is the first public figure to file a case against the Sun.
In response to Mr Watson's demand, News International released a statement in which it said "The allegations made in this claim have been carefully investigated by our lawyers and the evidence shows that they have no foundation whatsoever. If Mr Watson has specific information he should immediately hand it to the police and we urge him to do so. We are not aware of any evidence that The Sun engaged in activity as suggested by Mr Watson."
Scotland Yard has already arrested 16 people in connection with its investigation into phone-hacking at the NOTW.