Andrew Mitchell said last week that he hoped Pc Toby Rowland would give evidence on oath as part of separate libel proceedings against the Sun newspaper.
Mr Mitchell told Channel 4 News: "What I do know is that I was stitched up; I was fitted up in Downing Street by armed police officers ...
"We believe that the CCTV shows that the account of Pc Toby Rowland is at very best inaccurate."
More top news
The 13-year-old died in hospital after being hit in the back of the head by a bullet when his cousin fell of a hoverboard.
The psychiatrist brother of Chancellor George Osborne faces being struck off after admitting to an affair with a "vulnerable" patient.
Three men have been jailed for helping a 17-year-old join IS - after a trial heard one of them shared affectionate texts with the teenager.