Alex Salmond has called for a probe into whether Nicola Sturgeon breached the ministerial code to be extended.
The first minister referred herself for investigation by an independent panel over whether she broke any rules when complaints against Mr Salmond emerged.
Ms Sturgeon insisted that she acted “appropriately and in good faith”.
However Mr Salmond has said the remit of the current inquiry is a “straw man” designed to be knocked down, and said other issues could be looked into.
The former first minister has written to standards panel member James Hamilton to ask if he will investigate whether Ms Sturgeon had breached the ministerial code by misleading parliament