On Jun 22, 2020, President Donald Trump issued an executive order: 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:
(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.
 

Scope of Suspension and Limitation on Entry:
(a)  The suspension and limitation on entry pursuant to section 2 of this proclamation shall apply only to any alien who:
(i)    is outside the United States on the effective date of this proclamation;
(ii)   does not have a nonimmigrant visa that is valid on the effective date of this proclamation; and
(iii)  does not have an official travel document other than a visa (such as a transportation letter, an appropriate boarding foil, or an advance parole document) that is valid on the effective date of this proclamation or issued on any date thereafter that permits him or her to travel to the United States and seek entry or admission.
 

(b)  Exception:
(i)    any lawful permanent resident of the United States;
(ii)   any alien who is the spouse or child, as defined in section 101(b)(1) of the INA (8 U.S.C. 1101(b)(1)), of a United States citizen;
(iii)  any alien seeking to enter the United States to provide temporary labor or services essential to the United States food supply chain; and
(iv)   any alien whose entry would be in the national interest as determined by the Secretary of State, the Secretary of Homeland Security, or their respective designees.
 

Effective Date:
This proclamation is effective at 12:01 a.m. eastern daylight time on June 24, 2020.
 

Termination:
This proclamation shall expire on December 31, 2020, and may be continued as necessary.  Within 30 days of the effective date of this proclamation and every 60 days thereafter while this proclamation is in effect, the Secretary of Homeland Security shall, in consultation with the Secretary of State and the Secretary of Labor, recommend any modifications as may be necessary.