Hundreds of thousands of Chinese students enroll at U.S. colleges and universities each year, and right now, a lot of them are freaking out.

As schools try to figure out how to start the fall semester amid the coronavirus pandemic, some -- including Harvard University and the University of Southern California -- are opting for online-only instruction. And that means their foreign students will have to leave or transfer, according to new rules issued Monday by the U.S. Immigrations and Customs Enforcement agency.

In order to keep their student visas, foreign nationals have to take in-person classes, according to ICE. The new guidelines quickly sparked rage and anxiety in China, which sends more students to U.S. schools than any other country.