The provisions of this section do not apply to any budget authority proposed to be rescinded or that is to be reserved as set forth in a special message required to be transmitted under section 683 of this title.
2 U.S. Code § 684 - Proposed deferrals of budget authority
1987—Pub. L. 100–119 amended section generally, substituting substantially similar provisions in subsecs. (a) and (c) and substituting subsec. (b) for former subsec. (b) which read as follows: “Any amount of budget authority proposed to be deferred, as set forth in a special message transmitted under subsection (a) of this section, shall be made available for obligation if either House of Congress passes an impoundment resolution disapproving such proposed deferral.”