Labour's former spin doctor Damian McBride said he was "ashamed" of the way he treated Labour politicians he saw as rivals to Mr Brown, but he insisted he did not break the law, and said he would be happy to speak to police if they decide to look into complaints from a Conservative MP.
Mr McBride said he did not believe that Ed Miliband and Ed Balls were aware of the details of his briefing activities when he was working for Gordon Brown and added that he was ready to give up his pension if the civil service felt he should.
Mr McBride said:
"I feel ashamed and sorry to those individuals whose careers I affected and even more so to the innocent bystanders that got in the way - special advisers who lost their jobs as a result of them being pushed out of government, people that were mentioned in the context of these sleazy stories."
More top news
Michael Fallon has received reassurances from his US counterpart that security ties with Britain will "endure" following a vote for Brexit.
On Friday, police said it appeared the girl had shot herself in the face with the weapon.
The showers will be slow-moving, heavy and thundery at times, particularly in central and eastern areas.