From CBC News.

The Trump administration says national security is at the heart of its decision to "aggressively revoke" visas for Chinese nationals studying in the United States. The problem? There are nearly 300,000 of them, and it’s not clear how the Department of Homeland Security will decide who’s a mere student and who’s a spy. Andrew Chang explores the challenges of Trump’s policy and what the U.S. might lose by implementing it.

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