美国总统于昨日发布总统令，宣布从六月一日起，禁止一部分持F和J签证的中国公民入境美国。此总统令不影响绿卡申请的递交 (例如: EB1A, NIW)，也不影响美国境内转换/延长非移民身份申请的递交 (例如: I-539, I-129)。另外，此总统令不影响美国绿卡持有者，以及美国绿卡持有者/公民的配偶。

具体来说，此总统令Sec.1指出：

The entry into the United States as a nonimmigrant of any national of the PRC seeking to enter the United States pursuant to an F or J visa to study or conduct research in the United States, except for a student seeking to pursue undergraduate study, and who either receives funding from or who currently is employed by, studies at, or conducts research at or on behalf of, or has been employed by, studied at, or conducted research at or on behalf of, an entity in the PRC that implements or supports the PRC’s “military-civil fusion strategy” is hereby suspended and limited subject to section 2 of this proclamation.  For the purposes of this proclamation, the term “military-civil fusion strategy” means actions by or at the behest of the PRC to acquire and divert foreign technologies, specifically critical and emerging technologies, to incorporate into and advance the PRC’s military capabilities.

此总统令在Sec.2指出了很多不受影响的群体，例如:

[Sec.1 shall not apply to ] any alien who is studying or conducting research in a field involving information that would not contribute to the PRC’s military‑civil fusion strategy, as determined by the Secretary of State and the Secretary of Homeland Security, in consultation with the appropriate executive departments and agencies (agencies);

目前，关于哪一些entity “implements or supports the PRC’s military-civil fusion strategy”，美方并未公布具体细节。美方也未公布此总统令实施的具体standard。

持F/J签证的中国公民如有近期离开美国的计划，则需要做好短期内可能无法持F/J签证再次回到美国的准备。出境需谨慎。