The assignment of observers shall terminate in any political subdivision of any State
(1) with respect to observers appointed pursuant to section
1973f of this title or with respect to examiners certified under subchapters IA to IC before July 27, 2006, whenever the Attorney General notifies the Director of the Office of Personnel Management, or whenever the District Court for the District of Columbia determines in an action for declaratory judgment brought by any political subdivision described in subsection (b), that there is no longer reasonable cause to believe that persons will be deprived of or denied the right to vote on account of race or color, or in contravention of the guarantees set forth in section
1973b (f)(2) of this title in such subdivision; and
(2) with respect to observers appointed pursuant to section
1973a (a) of this title, upon order of the authorizing court.