user: Question: Which person has an expiring term of December 31, 2020, and has Terry Branstad as the appointing governor?
Columns: ['Name', 'Appointed/Elected', 'Term expires', 'Appointing Governor', "Governor's Party Affiliation"]
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Chief Justice Mark Cady', '1998', 'December 31, 2016', 'Terry Branstad', 'Republican']
SQL:

assistant: SELECT "Name" FROM "Table" WHERE "Term expires" = 'December 31, 2020' AND "Appointing Governor" = 'Terry Branstad';