Bengaluru, June 15 -- Samarth G.S., 25, hasn't been to his hometown, in Karnataka, in nearly two years. But not for the usual reasons. Last year, he stayed back in the US to look for an internship. This year, even though he has one, he's hesitating because of tightening visa regulations.

"The situation is dicey here," said Samarth, who is studying for a masters degree. With only a brief window between the end of his internship and the start of the next academic term, he's worried that even a slight delay in returning could put his visa at risk. "Even if I come back a day late, they might use it as an excuse to cancel my visa," he said, referring to US President's Donald Trump regime.

Even when they are travelling within the US, universi...