A federal judge in Boston issued a temporary restraining order today that effectively paused the Trump administration’s move to block international students from attending Harvard. The judge agreed with the university that the government’s decision would cause “immediate and irreparable injury” to the school.

The order came in response to a lawsuit that Harvard filed this morning, just a day after it was told that its ability to enroll foreign students was being revoked. The university accused the Trump administration of a “campaign of retribution” for rejecting the government’s demands.

The administration said Harvard had not complied with a list of demands sent on April 16, which called for the school to provide information on about 7,000 students within 10 business days. In this morning’s lawsuit, Harvard said that it had submitted the required information on April 30.

Harvard’s president called the ban “unlawful and unwarranted.” It would transform the university, where more than a quarter of the students come from other countries. They contribute disproportionately to the university’s revenue.

The restraining order was the latest sign that the courts are serving as a rare check on President Trump’s power. But as our legal policy reporter Charlie Savage explained, judicial losses have not necessarily stopped the president’s actions from having an impact.