President Donald Trump is moving to block nearly all foreign students from entering the country to attend Harvard University, his latest attempt to choke the Ivy League school from an international pipeline that accounts for a quarter of the student body.

Harvard University is striking back against President Trump’s latest effort to prohibit international students from enrolling in the school. In a federal court filing on Thursday, Harvard argued the administration’s move is “part of a concerted and escalating campaign of retaliation by the government in clear retribution for Harvard’s exercising its First Amendment rights.

The decision was a victory, at least temporarily, in the university’s confrontation with the White House, which has sought to undercut its finances and influence.