Executive Order 13753: Amending the Order of Succession in the Department of Homeland Security [open pdf - 188KB]
"By the authority vested in me as President by the Constitution and the laws of the United States of America, including the Federal Vacancies Reform Act of 1998, 5 U.S.C. 3345, et seq., it is hereby ordered as follows: Section 1. Section 88 of Executive Order 13286 of February 28, 2003 (''Amendment of Executive Orders, and Other Actions, in Connection With the Transfer of Certain Functions to the Secretary of Homeland Security''), is amended by striking the text of such section in its entirety and inserting the following in lieu thereof: ''Sec. 88. Order of Succession. Subject to the provisions of subsection (b) of this section, the officers named in subsection (a) of this section, in the order listed, shall act as, and perform the functions and duties of the office of, the Secretary of Homeland Security (Secretary), if they are eligible to act as Secretary under the provisions of the Federal Vacancies Reform Act of 1998, 5 U.S.C. 3345 et seq. (Vacancies Act), during any period in which the Secretary has died, resigned, or otherwise become unable to perform the functions and duties of the office of Secretary."
Executive Order 13753; EO 13753
Federal Register: http://www.gpo.gov/fdsys/browse/collection.action?collectionCode=FR
Federal Register (December 14, 2016), v.81 no.240, p.90667-90668