Tennessee Code Title 2. Elections § 2-13-313

Delegates elected from a congressional district shall be allocated among the presidential candidates and the uncommitted designation as proportionally as is mathematically possible to the number of votes received in the presidential preference election within such congressional district. If the votes received by a presidential candidate in any congressional district are less than fifteen percent (15%) of the votes cast in such district, no delegates shall be allocated to such candidate and such votes of less than fifteen percent (15%) shall be considered as votes for the uncommitted designation.