Author of the McGarvie Model, McGarvie was an appointed delegate to Constitutional Convention on an Australian republic in February 1998, and initiated the 2001 Corowa conference to find common ground among republicans after the referendum defeat in 1999. He took the unusual position of making contributions to republicanism, without directly supporting the broader republican movement. He promoted his own model and at the 1998 convention argued the provision for two-thirds parliamentary dismissal of a president was unworkable.