更改

移民的 法律 ， 自然就是《移民法》，即 [https://www.uscis.gov/laws-and-policy/legislation/immigration-and-nationality-act Immigration and Nationality Act]，收录于联邦法典（United States Code, USC）第8 卷编

排期对应的法规是《美国联邦法规》第22 卷 编 第1章第E分章第42部第F分部 [https://www.law.cornell.edu/cfr/text/22/part-42/subpart-F 22 CFR Chapter I, Subchapter E, Part 42, Subpart F - Numerical Controls and Priority Dates] 联邦法规是政府部门的操作指南。在三权分立的美国架构下，国会负责立法，行政部门根据法律制定法规。这些法规可以看作是对联邦法律的具体实施细则。

这是史上第二次修改排期表（第一次是 [[07大潮]]）。这一事件引发了所谓 Visagate，或者“签证门”诉讼。诉讼的结果是，法院判决，排期表在下月生效以前，不能认为是最终版。国务院有权在生效前做出改变。<blockquote>The two Visa Bulletins are not "definitive statements" but informative statements; the September 9, 2015, Visa Bulletin did appear to have a direct and immediate effect on the day-to-day business of Plaintiffs; the Visa Bulletins did not have the status of law, if at all, until October 1, 2015; immediate compliance with the terms of these Visa Bulletins was clearly not expected; and the Visa Bulletins did not necessarily answer a legal question. These indicia of finality support the Court's conclusion that the two Visa Bulletins in question do not constitute final agency action.</blockquote>随着第一次引入 AB表 导致的闹剧，USCIS 在随 之 后并没有一直使用 B表。在 2017年1月 更换总统以后，更出现了2018财年全年不 适 使 用 B表 的情况。这个半吊子的项目，目前只剩下了仍然在 DOS 网站挂着的那句“USCIS, in coordination with Department of State (DOS), is revising the procedures for determining visa availability for applicants waiting to file for employment-based or family-sponsored preference adjustment of status. The revised process will better align with procedures DOS uses for foreign nationals who seek to become U.S. permanent residents by applying for immigrant visas at U.S. consulates and embassies abroad.”