New State Department guidance on visa applications is adding to uncertainty for America's international students, who have faced intensifying scrutiny from President Donald Trump's administration.

In a cable sent Tuesday to U.S. embassies and consulates, Secretary of State Marco Rubio halted the scheduling of new visa interviews for international students as the department prepares guidelines for increased vetting of their activity on social media. Existing appointments may be kept and will proceed under current review guidelines, the cable said.

University of Wisconsin-Oshkosh student Vladyslav Plyaka was planning to visit Poland to see his mother and renew his visa, but he doesn’t know when that will be possible now that visa appointments are suspended. He also doesn’t feel safe leaving the U.S. even when appointments resume.

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