In counties other than those with a consolidated form of government or county charter, the county legislative body elects a chair and a chair pro tempore at its first session on or after September 1 of each year. The county legislative body may elect one of its own members as chair, or it may elect the county mayor; however, the county mayor is not required to take the office and may decline. If the county mayor is elected as chair and accepts the office, then the county mayor relinquishes the power to veto legislative resolutions of the county legislative body. However, these provisions do not apply in Knox, Hamilton, and Shelby. T.C.A. § 5-5-103. A county mayor who assumes the chair may vote to break tie votes of the county legislative body, but otherwise does not vote. T.C.A. § 5-5-109(b). The county mayor may not make or second a motion. Alternatively, the legislative body may elect one of its own members as chair, in which case the member who is also chair may vote on all issues as a regular member of the body, but may not vote again to break a tie vote. T.C.A. § 5-5-109.
If the county mayor does not serve as chairman, the county mayor has veto power over legislative resolutions (but not administrative or appellate resolutions) within 10 days of receiving the legislative resolution from the county commission. If a resolution is vetoed, the county mayor must return it to the commission with reasons for the veto. The commission may override the veto at the next regular meeting of the county commission or within 20 days of receiving the veto, whichever is later.
When the regular chair is unable or fails to attend meetings of the county legislative body, the chair is under a duty to notify the chair pro tempore who shall attend and discharge the duties of the chair. If neither is present, the county clerk will call the meeting to order for the election of one of the members to temporarily preside over the meeting. T.C.A. § 5-5-103.
The chair may designate another member of the county legislative body to sit in the chair's place on any board, authority or commission that the chair serves upon by virtue of holding the office of chair. Any such designee may vote or exercise any power the chair could exercise had the chair been in attendance.