Agencies Washington 

A federal judge late Thursday temporarily blocked a proclamation by President Donald Trump that banned foreign students from entering the US to attend Harvard University.

Trump's proclamation, issued Wednesday, was the latest attempt by his administration to prevent the nation's oldest and wealthiest college from enrolling a quarter of its students, who accounts for much of Harvard's research and scholarship.

Harvard filed a legal challenge the next day, asking for a judge to block Trump's order and calling it illegal retaliation for Harvard's rejection of White House demands. Harvard said the president was attempting an end-run around a previous court order.

A few hours later, US District Judge Allison Burroughs in Boston issued a temporary restraining order against Trump's Wednesday proclamation. Harvard, she said, had demonstrated it would sustain "immediate and irreparable injury" before she would have an opportunity to hear from the parties in the lawsuit.

Burroughs also extended the temporary hold she placed on the administration's previous attempt to end Harvard's enrolment of international students. Last month, the Department of Homeland Security revoked Harvard's certification to host foreign students and issue paperwork to them for their visas, only to have Burroughs block the action temporarily. 

Trump’s order this week invoked a different legal authority. If Trump's measure were to survive this court challenge, it would block thousands of students who are scheduled to come to Harvard's campus in Cambridge, Massachusetts, for the summer and fall terms.

"Harvard's more than 7,000 F-1 and J-1 visa holders - and their dependents - have become pawns in the government's escalating campaign of retaliation," Harvard wrote Thursday in a court filing.