; 8 U.S.C. 1103 note) is amended— (1) by amending subsection (a) to read as follows: (a) In general Not later than December 31, 2019, the Secretary of Homeland Security shall take such actions as may be necessary (including the removal of obstacles to detection of illegal entrants) to design, test, construct, and install physical barriers, roads, and technology along the international land border between the United States and Mexico to prevent illegal crossings in all areas. ; (2) in subsection (b)— (A) in paragraph (1)— (i) in the paragraph heading, by striking Additional fencing and inserting Fencing ; (ii) by striking subparagraph (A) and inserting the following: (A) Physical barriers In carrying out subsection (a), the Secretary of Homeland Security shall construct physical barriers, including secondary barriers in locations where there is already a fence, along the international land border between the United States and Mexico that will prevent illegal entry and will assist in gaining operational control of the border (as defined in section 2(b) of the Secure Fence Act of 2006 ( 8 U.S.C. 1701 note; Public Law 109–367 )). ; (iii) by striking subparagraph (B) and redesignating subparagraphs (C) and (D) as subparagraphs (B) and (C), respectively