Students around the world are anxiously tracking Harvard University’s feud with the Trump administration, which is seeking to keep it from enrolling international students. On Thursday, Harvard challenged President Donald Trump's latest move to bar foreign students from entering the U.S. to attend the college, calling it illegal retaliation for Harvard’s rejection of White House demands. In an amended lawsuit filed Thursday, Harvard said the president was attempting an end-run around a previous court order. A few hours later, U.S. District Judge Allison Burroughs issued a temporary restraining order against Trump's Wednesday proclamation, saying Harvard had demonstrated “it will sustain immediate and irreparable injury before there is an opportunity to hear from all parties.” Last month, a federal judge blocked the Department of Homeland Security from revoking Harvard’s certification to host foreign students. Increasingly, the nation’s oldest and best-known university has attracted some of the brightest minds from around the world, with international students accounting for one-quarter of its enrollment. As Harvard’s fight with the administration plays out, foreign students can only wait to find out if they'll be able to attend the school at all. Some are weighing other options.