1. Short title This Act may be cited as the Countering Weapons of Mass Destruction Act of 2018 . 2. Countering Weapons of Mass Destruction Office (a) In general Title XIX of the Homeland Security Act of 2002 ( 6 U.S.C. 591 et seq.) is amended— (1) in the title heading, by striking Domestic Nuclear Detection Office and inserting Countering Weapons of Mass Destruction Office ; (2) by striking section 1901 and inserting the following: 1900. Definitions In this title: (1) Assistant Secretary The term Assistant Secretary means the Assistant Secretary for the Countering Weapons of Mass Destruction Office. (2) Intelligence community The term intelligence community has the meaning given such term in section 3(4) of the National Security Act of 1947 ( 50 U.S.C. 3003(4) ). (3) Office The term Office means the Countering Weapons of Mass Destruction Office established under section 1901(a). (4) Weapon of mass destruction The term weapon of mass destruction has the meaning given the term in section 101 of the Foreign Intelligence Surveillance Act of 1978 ( 50 U.S.C. 1801 ). A Countering Weapons of Mass Destruction Office 1901. Countering Weapons of Mass Destruction Office (a) Establishment There is established in the Department a Countering Weapons of Mass Destruction Office. (b) Assistant Secretary The Office shall be headed by an Assistant Secretary for the Countering Weapons of Mass Destruction Office, who shall be appointed by the President. (c) Responsibilities The Assistant Secretary shall serve as the Secretary’s principal advisor on— (1) weapons of mass destruction matters and strategies