I can&#x27;t speak for CS, but I got a PhD in applied math at a respectable school in Virginia and about 90% of our grad students were not US citizens. To my knowledge, every one of them left on completion of their degrees and I can&#x27;t remember a single one who actually expressed an interest in staying. I think people who see STEM grad students as some sort of huddled masses yearning for US residency are pretty out of touch with reality. This isn&#x27;t 1960 anymore.