Former spy agency boss Sir Bruce Ferguson says Prime Minister John Key must be "smoking dope" for linking failings at the bureau to him and other former directors with a military or defence background.
The comment is the latest salvo in a tit-for-tat skirmish between the pair which began when Sir Bruce last week slammed the process which saw Mr Key's childhood friend and top civil servant Ian Fletcher appointed as GCSB spy bureau director after the Prime Minister rang him about the job in 2011.
Mr Key hit back at the time, saying Sir Bruce was speaking out publicly because he was implicated in the draft version of a soon-to-be released report by former Cabinet Secretary Rebecca Kitteridge, which would identify "quite significant" and long-standing problems within the bureau.
Mr Key said there were "issues that were there under Mr Ferguson and others and that shows you that just having a military or defence background actually hasn't delivered the robustness of that organisation that New Zealanders would expect".
Sir Bruce said yesterday he took "great exception" to Mr Key's comments.