; (2) allocating a set number of seats for such aliens for each metropolitan area; and (3) allowing a metropolitan area to trade or give some of seats allocated to such area under paragraph (2) for such aliens to other areas in the region of such area based on the transportation needs of each area. (c) Authorization of appropriations In addition to the amounts otherwise authorized to be appropriated, there is authorized to be appropriated $10,000,000 for each of fiscal years 2018 through 2021 to carry out this section. 2 Strong Visa Integrity Secures America Act 1531. Short title This chapter may be cited as the Strong Visa Integrity Secures America Act . 1532. Visa security (a) Visa security units at high risk posts Section 428(e)(1) of the Homeland Security Act of 2002 ( 6 U.S.C. 236(e)(1) ) is amended— (1) by striking The Secretary and inserting the following: (A) Authorization Subject to the minimum number specified in subparagraph (B), the Secretary