Section was formerly classified to section 64b of this title prior to editorial reclassification and renumbering as this section.

1984—Pub. L. 98–367 struck out provisions relating to exception for duties of the Secretary as disbursing officer of the Senate.

1974—Pub. L. 93–371 inserted provisions relating to the absence of Secretary of Senate for reasons other than disability and the written designation of such absent status.