Labor has asked the Australian Federal Police to urgently investigate a $350,000 job offer Scott Morrison's right-hand man Scott Briggs made to the man who was set to roll Liberal MP Craig Kelly for preselection in his seat of Hughes.

The Sydney Morning Herald and The Age revealed on Thursday that Mr Briggs had offered Sutherland Shire councillor Kent Johns a $350,000 job for six months' work as the Liberals' federal campaign director in NSW, on the understanding he would withdraw from the contest against Mr Kelly.

Liberal MP Craig Kelly survived the preselection showdown only after intervention from the PM. Credit:Dominic Lorrimer

That campaign role would normally be part of state director Chris Stone's position, although the party wants to bring in additional firepower because of the back-to-back NSW and federal elections.

Labor senator Don Farrell, the shadow special minister of state, wrote to AFP Commissioner Andrew Colvin on Friday asking him to investigate the matter "to protect the integrity of our democracy", arguing the job offer could be considered a bribe.