Senate Rule XXI - Session with closed doors

111th Congress
1. On a motion made and seconded to close the doors of the Senate, on the discussion of any business which may, in the opinion of a Senator, require secrecy, the Presiding Officer shall direct the galleries to be cleared; and during the discussion of such motion the doors shall remain closed.

2. When the Senate meets in closed session, any applicable provisions of rules XXIX and XXXI, including the confidentiality of information shall apply to any information and to the conduct of any debate transacted.

109th Congress
1. On a motion made and seconded to close the doors of the Senate, on the discussion of any business which may, in the opinion of a Senator, require secrecy, the Presiding Officer shall direct the galleries to be cleared; and during the discussion of such motion the doors shall remain closed.

2. When the Senate meets in closed session, any applicable provisions of rules XXIX and XXXI, including the confidentiality of information shall apply to any information and to the conduct of any debate transacted.

Resources

 * Rules of the 109th U.S. Senate

Articles

 * "Rule XXI," U.S. Senate - Committee on Rules and Administration, 2005.