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reporter: students like hu desperate to return to the u.s. his research focuses on using social media data to assess bias in the public domain. i definitely don t get the impression that his research is a military-sensitive thing. i also don t get the impression that he is a person that s trying to sneak in or anything. it hurt me with those accusations, labeling of being a chinese spy. reporter: it is concerning enough for chinese officials to raise the issue of student visa restrictions in recent high-level talks with their u.s. counterparts, calling it unfair treatment. but in the u.s., there are american graduate students likewise kept from re-entering china. and i was essentially meant to graduate this year, 2021. reporter: walid khan and his brother lived in shanghai until the outbreak. the medical student thought it would be a brief hiatus and then he d be back to finish his sixth and final year. instead, the brothers are left waiting in their l.a.-area home.

United statesSocial mediaDennis huPublic domainStudent visa restrictionsWalid khanTo shanghaiLos angeles