Question: Scott Andrew Buchholz, is an Australian politician, he previously served as chief of staff to which Queensland Senator Australian politician, who has served as the Deputy Prime Minister of Australia since 18 February 2016?
Sentence (from "Barnaby Joyce"): Barnaby Thomas Gerard Joyce (born 17 April 1967) is an Australian politician who has served as the Deputy Prime Minister of Australia since 18 February 2016, as the Leader of the National Party of Australia since 11 February 2016, and as the Minister for Agriculture and Water Resources since 21 September 2015.
Relevant evidence: Yes