In 1876, he was re-elected in the riding of Charlevoix. His opponent contested the election and it was declared invalid, but he won the subsequent by-election in 1877. He was defeated in Rimouski in 1878 but elected by acclamation in the riding of Trois-Rivières in the same year. Langevin became Minister of Public Works again in 1879. He lobbied behind the scenes against the hanging of Louis Riel in 1885 and was one of the few Conservatives Members of Parliament to survive the resulting backlash in the province of Quebec in 1887. He was promised the post of Lieutenant Governor of Quebec by the new Conservative Prime Minister John Abbott if he stepped down as Minister of Public Works. Langevin stepped down in 1891 but Abbott appointed Joseph-Adolphe Chapleau instead. In 1891 he was implicated with Thomas McGreevy in what became known as the "McGreevy-Langevin scandal" over kickbacks to McGreevy associated with federal contracts granted to him by the department of public works overseen by Langevin. He joined the backbenches and then left politics in 1896.
1The office of Postmaster General was abolished when the Post Office Department became a Crown Corporation known as the Canada Post Corporation on October 16, 1981.
1The department was eliminated in 1993 when the government was reorganized. The position of Secretary of State for Canada was not legally eliminated until 1996 when its remaining responsibilities were assigned to other cabinet positions and departments, particularly the newly created position of Minister of Canadian Heritage.
1The offices of Minister of Immigration and Colonization, Minister of the Interior, Minister of Mines and Superintendent-General of Indian Affairs were abolished and the office of Minister of Mines and Resources was created and came in force on December 1, 1936.