. . . "26 June 2013" . . . . . . . "20 September 2015" . . . . "Leader of the Senate" . "Deputy Leader of the Government in the Senate" . "Leader of the Government" . "Leader of the Government in the Senate" . . . "Leader of the Government in the Senate (Australia)" . . . "''Leader of the Government in the Senate''" . . . . . "Leader of the Government in the Senate (Australia)" . . "Deputy Government Senate Leader" . . "20 December 2017" . . "leader of the government in the Senate" .