The move could have a major impact on the international student population in the U.S. – a quarter of which was made up of students from China last year.

Chinese students in the U.S. are scrambling to figure out their futures after Secretary of State Marco Rubio announced that some of them would have their visas revoked.

Chinese students make up nearly up nearly a quarter of all international students in the United States. Here’s who they are and what they’re studying.