Masse was re-elected in 1970. He was a leadership candidate at the party convention of 1971, but lost by 21 votes. He left the Union Nationale to sit as an independent until his term expired in 1973. In 1974, Masse was hired by the engineering firm Lavalin as an administrator.
Prime Minister Mulroney appointed Masse to the position of Minister of Communications. Masse resigned from the Canadian Cabinet on September 25, 1985, during an investigation by the Royal Canadian Mounted Police of alleged overspending during his election campaign. He returned to Cabinet on November 30 after being cleared of any wrongdoing.
As Communications Minister, Masse was responsible for Canada's cultural policy. He argued against measures that would undermine the country's cultural sovereignty during negotiations leading to the Canada–United States Free Trade Agreement. He was moved out of the Communications portfolio to that of Minister of Energy in 1986 when it appeared to Mulroney that Masse might be an obstacle to the free trade negotiations. Masse was moved back to Communications following the 1988 election and the implementation of the Free Trade Agreement.
In 1991, Masse became Minister of National Defence. He resigned from cabinet in January 1993 along with a number of other ministers who were not intending to run in the 1993 election.
Retirement
Since leaving federal politics Masse, a moderate Quebec nationalist, has served in a number of positions under the Parti Québécois governments of Jacques Parizeau and Lucien Bouchard. He was head of one of fourteen regional committees that held public hearings on Quebec independence in 1995 in the run up to the 1995 Quebec referendum on sovereignty. He served as president of the Conseil de la langue française du Québec in 1995, and as Quebec's delegate-general in France from 1996 to 1997. He has also served as chair of the Commission des biens culturels du Québec.
1The offices of Minister of Communications, and Minister of Multiculturalism and Citizenship were abolished and the office of Minister of Canadian Heritage came in force July 12, 1996.