The Trump administration is trying to block Harvard from enrolling international students. A Harvard official said the move is already creating major disruptions.

The administration’s action was illegal and would cause irreparable harm, because about a quarter of Harvard students are from other countries, lawyers argued.

Days after his administration moved to stop Harvard University from enrolling foreign students, President Trump said at a news conference Wednesday that the Ivy League college should set a limit for how many international students it accepts.