PA - GETTYDamian Green's career is hanging by a thread over porn and harassment allegations
Former Greater Manchester chief constable Sir Peter Fahy said the retired officers were entering "dangerous territory" over the leaks.
And former attorney general Dominic Grieve said the information had "the smack of the police state".
He added: "This can't be right. They are in flagrant breach of their own code of conduct and practice.”
The leaks have left Mr Green's political career hanging in the balance as he also faces a Cabinet Office inquiry into alleged inappropriate behaviour towards a young female activist.Related articles
Mr Green, who is effectively Theresa May’s deputy prime minister, has denied looking at or downloading porn on the work computer.
Speaking to reporters at his Kent home on Friday, Mr Green said: "I've said I am not commenting any further while the investigation is going on.
"I have maintained all along and I still maintain - it is the truth - that I did not download or look at pornography on my computer, but obviously while the investigation is going on I can't say any more."
On Friday, ex- Scotland Yard detective Neil Lewis told the BBC he was "shocked" at the volume of material found in a 2008 raid on Mr Green's Westminster office and had "no doubt whatsoever" that it had been amassed by the Tory MP.
PADamian Green denied looking at or downloading porn
I have maintained all along and I still maintain - it is the truth - that I did not download or look at pornography on my compute
The allegations echoed claims made by former Metropolitan Police Service (MPS) assistant commissioner Bob Quick, who went public last month with his account of the material discovered during an investigation into Home Office leaks.
However the leaks have been widely condemned, with Sir Peter strongly