By Emma Tucker, Andy Rose, CNN

(CNN) — President Donald Trump has signed a proclamation to suspend international visas for new students at Harvard University, the White House announced Wednesday, in a dramatic escalation of its efforts to block foreign nationals from enrolling at the elite university.

The proclamation temporarily blocks the entry of nearly all new international Harvard students under visas most use to study at US universities or participate in academic exchange programs. It also directs the Secretary of State “to consider revoking” those visas – known as F, M and J visas – for current Harvard students who meet the proclamation’s “criteria,” the White House said in a statement.

The move throws Harvard’s ability to enroll international students – which make up about 27% o

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