The Leader of the Government in the Senate (French: Leader du gouvernement au Senat) sÃ©nat is A senator who leads The government side in The Canadian senate and is chiefly responsible for promoting and defending The'government s program in The Upper. housen 1968, the position of Leader of the Government in the Senate became an official cabinet position in its own right with the appointment of Paul Martin, Sr. (father of Canada's future prime minister, Paul Martin).