; and (2) cross designation should be available for personnel who will assist more than one agency or department of the United States at land ports of entry to facilitate and expedite the flow of increased legitimate trade and commerce. 2108. Authorization of appropriations In addition to any amounts otherwise authorized to be appropriated for such purpose, there is authorized to be appropriated $4,250,000,000 for each of fiscal years 2019 through 2023 to carry out this title, of which $250,000,000 in each such fiscal year is authorized to be made available to implement the biometric exit data system described in section 416 of the Homeland Security Act of 2002, as added by section 2106 of this division. 2109. Definition In this title, the term Secretary means the Secretary of Homeland Security. III Visa Security and Integrity 3101. Visa security (a) Visa security units at high risk posts Paragraph (1) of section 428(e) of the Homeland Security Act of 2002 ( 6 U.S.C. 236(e) ) is amended— (1) by striking The Secretary and inserting the following: (A) Authorization Subject to the minimum number specified in subparagraph (B), the Secretary ; and (2) by adding at the end the following new subparagraph: (B) Risk-based assignments (i) In general In carrying out subparagraph (A), the Secretary shall assign employees of the Department to not fewer than 75 diplomatic and consular posts at which visas are issued. Such assignments shall be made— (I) in a risk-based manner; (II) considering the criteria described in clause (iii)