City of Canning Commissioner Linton Reynolds and Riverton MLA Mike Nahan clashed over local government reform.
Mr Reynolds was forced to adjourn the Agenda Settlement Briefing to confront Dr Nahan, who was outside talking to residents.
About 20 residents and Mr Nahan attended the briefing to discuss the proposal for a Masters store to be built in Willetton.
Once the item had been discussed, the majority of people at the briefing, including Mr Nahan, left the chamber.
Discussions about local government reform then pursued for about five minutes in the foyer with Dr Nahan talking to residents before Mr Reynolds was forced to adjourn the meeting.
The two heavyweights discussed semantics of proposals and submissions for Canning to remain standalone and the financial situation of Canning.
The City of Canning cannot put in a proposal to remain standalone, but can put in a submission to the Local Government Advisory Board to remain within its current boundaries.
After about 15 minutes of discussion, residents and Mr Nahan left the premise and the briefing continued.