The county mayor serves as a nonvoting, ex officio member of the legislative body; as such the county mayor may not make or second a motion. Op. Tenn. Att'y Gen. 86-194 (December 1, 1986).
The county mayor may be elected chairperson of the legislative body. A county mayor who serves as chair of the legislative body may cast a vote in the event of a tie. T.C.A. § 5-5-109. However, if the county mayor becomes chair, the mayor's veto power is forfeited. T.C.A. § 5-5-103. If not chair of the county legislative body, the county mayor has veto power over legislative resolutions (not administrative or appellate resolutions) adopted by the legislative body.
When a resolution is adopted by the legislative body, it should be submitted to the county mayor. Each resolution must be signed, vetoed, or allowed to become effective without the county mayor's signature. If a resolution is signed by the county mayor, it becomes effective immediately or at a later date specified in the resolution. If the county mayor vetoes the resolution, he or she must return the resolution to the legislative body for action on the veto, and the resolution becomes effective only upon subsequent passage by a majority of all legislative body members. Such passage must take place within 20 days of receiving the county mayor's veto or at the legislative body's next regular meeting, whichever is later. If the county mayor does not sign or veto a resolution or report the mayor's action to the legislative body within 10 days after the resolution is submitted to him or her, the resolution becomes effective without the mayor's signature after 10 days or at a later date if the resolution so provides. T.C.A. § 5-6-107. The county mayor who does not chair the county legislative body may veto the entire county budget but may not veto portions of it. T.C.A. § 5-6-107.
The county mayor or the county mayor's representative also serves as a nonvoting, ex officio member of each committee of the legislative body, except as provided by law or by the legislative body. T.C.A. § 5-6-106.