There are many ideas you can use. Here are couple ones I just come up with...

1.) Theme: Finance Minister is the scapegoat of this incident.
Draw a RCMP person holding a club with his right hand, and picking up a small person (Goodale) in a threatening pose, saying "You're gonna cover it up for us". In the background, draw caricatures of a group of political leaders (must include Harper of course), surrounding huge sums of cash.

2.) Theme: Criticizing Finance Minister's refusal of resignation on the incompetency of Finance Department.
Draw a serious looking Goodale announcing "our department is alright" to a group of medias. In the background, draw a group of people messing around, and label them "Finance Department".