特朗普颁布新政：参加链接 https://www.whitehouse.gov/presi ... ronavirus-outbreak/
Proclamation Suspending Entry of Aliens Who Present a Risk to the U.S. Labor Market Following the Coronavirus Outbreak
关键点：
Sec. 2.  Suspension and Limitation on Entry.  The entry into the United States of any alien seeking entry pursuant to any of the following nonimmigrant visas is hereby suspended and limited, subject to section 3 of this proclamation:

(a)  an H-1B or H-2B visa, and any alien accompanying or following to join such alien;

(b)  a J visa, to the extent the alien is participating in an intern, trainee, teacher, camp counselor, au pair, or summer work travel program, and any alien accompanying or following to join such alien; and  

(c)  an L visa, and any alien accompanying or following to join such alien.


那J类签证又具体分为哪些呢？请参见https://travel.state.gov/content ... nonimmigrant%20visa,of%20Educational%20and%20Cultural%20Affairs.

具体而言包括这么几类：
Au pair and EduCare
Camp Counselor
Government Visitor
Intern
International Visitor (Dept. of State use)
Physician
Professor and Research Scholar
Short-term Scholar
Specialist
Student, college/university
Student, secondary
Summer Work Travel
Teacher
Trainee

而根据经验，CSC项目联合培养博士生的签证类型一般是J1中的research scholar、visiting student ，所以看起来依靠CSC项目去美国联培的phd似乎不太受这个政策的影响（字面上，实际上会不会被牵连就不好分析了）

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