1980 Republican Party presidential primaries

The 1980 Republican presidential primaries were how voters of the Republican Party chose its nominee for President of the United States in the 1980 U.S. presidential election. 
Former California Governor Ronald Reagan was selected as the nominee through a series of primary elections and caucuses which happened in the Republican National Convention held from July 14 to July 17, 1980, in Detroit, Michigan.
Nominees.
Declined to run.
The following potential candidates declined to run for the Republican nomination in 1980.