Tennessee Constitution
Article III - Executive Department.
Section 18

Every bill which may pass both Houses of the General Assembly shall, before it becomes a law, be presented to the governor for his signature. If he approve, he shall sign it, and the same shall become a law; but if he refuse to sign it, he shall return it with his objections thereto, in writing, to the House in which it originated; and said House shall cause said objections to be entered at large upon its journal, and proceed to reconsider the bill. If after such reconsideration, a majority of all the members elected to that House shall agree to pass the bill, notwithstanding the objections of the executive, it shall be sent, with said objections, to the other House, by which it shall be likewise reconsidered. If approved by a majority of the whole number elected to that House, it shall become a law. The votes of both Houses shall be determined by yeas and nays, and the names of all the members voting for or against the bill shall be entered upon the journals of their respective Houses.

If the governor shall fail to return any bill with his objections in writing within ten calendar days (Sundays excepted) after it shall have been presented to him, the same shall become a law without his signature. If the General Assembly by its adjournment prevents the return of any bill within said ten-day period, the bill shall become a law, unless disapproved by the governor and filed by him with his objections in writing in the office of the secretary of state within said ten-day period.

Every joint resolution or order (except on question of adjournment and proposals of specific amendments to the Constitution) shall likewise be presented to the governor for his signature, and on being disapproved by him shall in like manner, be returned with his objections; and the same before it shall take effect shall be repassed by a majority of all the members elected to both houses in the manner and according to the rules prescribed in case of a bill.

The governor may reduce or disapprove the sum of money appropriated by any one or more items or parts of items in any bill appropriating money, while approving other portions of the bill. The portions so approved shall become law, and the items or parts of items disapproved or reduced shall be void to the extent that they have been disapproved or reduced unless repassed as hereinafter provided. The governor, within ten calendar days (Sundays excepted) after the bill shall have been presented to him, shall report the items or parts of items disapproved or reduced with his objections in writing to the House in which the bill originated, or if the General Assembly shall have adjourned, to the office of the secretary of state. Any such items or parts of items so disapproved or reduced shall be restored to the bill in the original amount and become law if repassed by the General Assembly according to the rules and limitations prescribed for the passage of other bills over the executive veto.