Columbia subject headings:
Presidential candidates--United States--History--21st century.
Presidents--United States--Election--2016.
Republican Party (U.S. : 1854- )
Harvard subject headings:
Presidents--United States--Nomination
Republican Party (U.S. : 1854- )
United States--Politics and government--2009-2017.
Princeton subject headings:
Republican Party (U.S. : 1854- )