He was re-elected in the 1972, 1974, 1979 and 1980 federal elections as the riding changed names to Pontiac and Pontiac—Gatineau—Labelle.Lefebvre served six consecutive terms in the 27th through 32nd Canadian Parliaments until becoming a Senator of the De Lanaudière division in 1984.
He remained a member of the Canadian Senate until his death in 1992 of cancer.