The US president issued the proclamation on Wednesday, citing "national security" concerns and declaring it "detrimental" to US interests to continue allowing foreign students at the institution. Donald Trump has suspended for an initial six months the entry of foreign students seeking to study or participate in exchange programmes at Harvard University. Watch: Harvard president gets standing ovation as he praises international students at commencementWednesday's order comes after a judge blocked the Department of Homeland Security (DHS) from banning international students at Harvard in a ruling last week. For the 2024-2025 school year, Harvard enrolled nearly 7,000 foreign students, who made up 27% of its population. Last week, a Chinese Harvard student called for unity during the university's graduation ceremony, just days after Trump vowed to "aggressively" revoke visas for Chinese students.