The former prime minister has responded to the inquiry into the Iraq war.
The circumstances in which the legality of military action was decided were "far from satisfactory."
Britain decision to launch 2003 military action "was not a last resort," Sir John Chilcot said.
Chilcot's report on the Iraq War is due to be released in full Wednesday.
The inquiry into the Iraq War is due to be published on Wednesday.
The report covers British involvement in Iraq between 2001 and 2009.