U.S. President Donald Trump on Wednesday suspended for an initial six months the entry into the United States of foreign nationals seeking to study or participate in exchange programs at Harvard University,

The university called it “yet another illegal retaliatory step” from an administration that has sought ways to circumnavigate the courts in its push to bar foreign students.

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.