They plan to change the legal loophole where suspected war criminals and those accused of crimes against humanity before 2001 can remain at large in the UK and avoid prosecution.
Speaking at the press conference, the PM said:
My message to those accused is simply - your time is up. You may have run from responsibility but you can no longer hide from justice.
I look forward to the day when Blair, Brown, Straw and the myriad of other world neo-con leaders and hawks have those words come back to haunt them.