OTTAWA - The defence for Ottawa Mayor Larry O'Brien is suggesting it was O'Brien's chief accuser who raised the prospect of a federal appointment that's at the heart of the influence-peddling trial.

Lawyer Michael Edelson has been cross-examining the prosecution's main witness, Terry Kilrea, for six gruelling days and is finally getting to the crux of the allegations.

Edelson is attacking small variations in Kilrea's account of a July 2006 conversation with O'Brien, when a bribe was allegedly offered.

O'Brien is charged with two counts of influence peddling relating to his alleged offer to get fellow right-wing mayoral candidate Kilrea out of the municipal race.

O'Brien's lawyer spent days attacking Kilrea's credibility on a host of issues.