Tennessee Code Title 2. Elections § 2-5-205

(1) The names of persons for whom the chair of a statewide political party has certified to be placed on the ballot for the office of president of the United States to the secretary of state. The secretary of state shall submit the names to the state election commission no later than the first Tuesday in December immediately preceding the year in which the election will be held. If a candidate who has been certified by the secretary of state wishes to be a candidate in the presidential primary of a party other than that for which the chair of the statewide political party certified the candidate, then the candidate shall signify the candidate's political party preference to the state election commission no later than twelve o'clock (12:00) noon, prevailing time, on the date established in subsection (b), and the candidate's name must be certified only for the ballot of the candidate's chosen party, as the case may be.

(2) The names of persons for whom nominating petitions, signed by at least two thousand five hundred (2,500) registered voters of the party whose nomination is sought and by the candidate, are filed not later than twelve o'clock (12:00) noon, prevailing time, on the first Tuesday in December of the year before the year in which the election will be held. The nominating petitions shall be filed with the state election commission and certified duplicates with the coordinator of elections and with the chair of the candidate's party's state executive committee. No candidate may enter the presidential primary of more than one (1) statewide political party.