[1] He was a co-ordinator for Mayor Jean Doré's Montreal Citizens' Movement (MCM) in the Saint-Michel in the early 1990s, before leaving the party over its failure to close the Miron quarry urban landfill site.
Bourque's party won a majority on council, and Tamburello initially served as backbench supporter of the administration.
Tamburello supported Bourque during Vision Montreal's 1997 inter-party crisis and was named as an associate member of the executive committee on February 5, 1997.
[4] He was re-elected in the 1998 election and was promoted to full executive committee membership on November 12, 1998, with responsibility for parks, gardens, and greenspace.
Tamburello and Tremblay said that they were not seeking to intervene on behalf of Rosenberg, but were curious about the status of a file involving the developer.