There are some exceptions. Among them, the proclamation says officials will come up with standards to let in people treating Covid-19 patients or conducting research to help the US combat the pandemic.
It also will draft similar standards to admit people who are critical to national security, are necessary to help the country’s economic recovery or are essential to the US food supply chain. And the new measures don’t apply to people who’ve already been issued valid visas.
Here’s a look at what kind of jobs are included in Trump’s proclamation, and how many people could be affected in each visa category.
What kind of work these visas cover: The H-1B is most well known as a visa for skilled tech workers, but workers in other industries, like health care and the media, have also been known to use these visas.
How many people could be affected: 29,000, according to MPI’s estimates, plus some 19,000 dependents on H-4 visas.
What it is: According to USCIS, the H-2B program allows US employers or agents “to bring foreign nationals to the United States to fill temporary nonagricultural jobs.”
How many people could be affected: 23,000, according to MPI.
What kind of work these visas cover: Trump’s proclamation lists a number of impacted workers, including interns, trainees, teachers, camp counselors, au pairs and participants in summer work travel programs.
How many people could be affected: 72,000, according to MPI (plus some 11,000 dependents on J-2 visas).
What kind of work these visas cover: Managers, executives and employees with specialized knowledge.
How many people could be affected: 6,000, according to MPI (plus some 7,000 dependents on L-2 visas).
CNN’s Priscilla Alvarez contributed to this report.