benefit decisions. At least 50 of these additional attorney positions shall be used by the Attorney General to increase the number of U.S. Citizenship and Immigration Service attorneys serving as Special Assistant U.S. Attorneys, on detail to the Department of Justice, Offices of the U.S. Attorneys, to assist with immigration-related litigation. (C) Facilities and support personnel The Attorney General and Secretary are authorized to procure space, temporary facilities, and to hire the required administrative and legal support staff, on an expedited basis, to accommodate the additional positions authorized under this paragraph. (4) Authorization of appropriations There are authorized to be appropriated, for each of the fiscal years 2018 through 2021, such sums as may be necessary to carry out this subsection. (c) Department of State (1) Visa specialists By not later than September 30, 2021, in addition to positions authorized before the date of the enactment of this Act and any existing attorney vacancies within the Department on such date of enactment, the Assistant Secretary of State for Consular Affairs shall increase the number of trained, full-time analysts within the Bureau of Consular Affairs by not fewer than 50. Such analysts primarily should handle and advise on cases and matters involving the potential for visa denial on the basis of national security and public safety concerns. (2) Immigration attorneys By not later than September 30, 2021, in addition to positions authorized before the date of the enactment of this Act and any existing attorney vacancies within the Department on such date of enactment, the Assistant Secretary of State for Consular Affairs shall increase the number of trained, full-time, active attorneys adviser within the Bureau of Consular Affairs by not fewer than 25. Such attorneys primarily should handle and advise on cases and matters involving the potential for visa denial on the basis of national security and public safety concerns. (3) Authorization of appropriations There