About 2.5 million students began college in 2018-2019. In that year, over 10% of them were international students — about 270,000 new students. The enrollment of new international students in the Fall 2020-21 academic year is projected to decline 63% to 98% from the 2018-19 level. (From here.) This is even with the recission of the rule to bar international students.
Several factors are behind this, including difficulties in obtaining visas, and the greater risk of acquiring the virus in the U.S. compared to other countries.
The pandemic + the Trump administration’s instinctive antipathy towards immigration (as the fiasco of barring international students, which lasted for less than a week) are happening at a time when other advanced countries are wooing international students. Canada, for instance, is making it easier for international students to gain work permits (here).
Two thirds of post BA international students in computer sciences used to come from India. Even before the pandemic, there was a decline in this inflow (here).