Brien was elected in the Témiscamingue electoral district under the Bloc Québécois party in the 1993, 1997 and 2000 elections, serving in the 35th, 36th and 37th Canadian Parliaments respectively. He had served as the party's whip from 15 August 2001 until 16 December 2002.
Brien left the Bloc Québécois following his decision to seek a seat in the Quebec National Assembly with the Action démocratique du Québec (ADQ). He remained in federal Parliament as an independent Member of Parliament from 16 January 2003 until he resigned from federal politics on 14 March 2003. He became the ADQ's candidate in the provincial Rouyn-Noranda–Témiscamingue riding, but he and Rémy Trudel of the Parti Québécois both lost against Liberal Daniel Bernard in the 2003 Quebec election.
- CBC News: "Bloc MP quits to join Action Democratique", 13 January 2003, accessed 13 July 2006.
- Pierre Brien – Parliament of Canada biography
- CBC News: Quebec Votes 2003: Rouyn-Noranda-Témiscamingue profile
Gabriel Desjardins, Progressive Conservative
|Members of Parliament from Témiscamingue||Succeeded by
Gilbert Barrette, Liberal
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