The US has ordered a pause in embassies scheduling appointments for student visas.
It comes as the government plans to expand social media vetting for international applicants, with the Trump administration believing some colleges are too left-wing and allow antisemitic protests.
Secretary of State Marco Rubio has sent a memo to diplomatic posts saying they should stop arranging interviews 'until further guidance'.
The Guardian's Washington bureau chief David Smith says Donald Trump's government is hardening its stance.
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