WHICH VISA CATEGORIES ARE BLOCKED?- H-1B visas for skilled workers, which are often used by the tech industry- L visas for executives, managers and specialized workers being transferred within a company- H-2B visas for seasonal workers, many of which are in the landscaping business- J visas for cultural exchange, including interns, trainees, teachers, camp counselors, au pairs and people participating in a summer work travel programThe proclamation also blocks family members who would accompany workers on such visas.DOES THE TEMPORARY BAN APPLY TO VALID VISA HOLDERS?Foreign workers already in the United States with a valid visa will not be affected.