Police Minister Mark Mitchell says Rakesh Naidoo has been privy to sensitive information.
Naidoo is 13th on Labour's list.
It comes as Labour releases its list for candidates for the election.
The review will look at the period during which Rakesh Naidoo was engaging with the Labour Party.
The Labour leader has defended his newest candidate as someone with the utmost integrity.
Labour's leader has accused Richard Chambers of 'making a statement that basically has no evidential base' about a superintendent named as a Labour candidate.
Rakesh Naidoo's selection has kicked off a political stoush between Labour and National.