The US State Department has instructed US embassies and consulates around the world to pause new student visa appointments as it moves to expand “social media screening and vetting” to all applicants for student visas, according to a diplomatic cable seen by CNN.

It’s the latest move from the Trump administration that could deter international students from studying at universities in the United States.

The cable, issued on Tuesday morning and signed by Marco Rubio, comes as the Trump administration has revoked scores of student visas and has attempted to stop foreign students from studying at Harvard University – a move that has been halted by a judge for the time being.