Some Harvard sports teams might struggle to field teams without foreign students. Not long after President Donald Trump’s first attempt to bar Harvard from enrolling international students last month, the school’s men’s soccer team, along with athletic teams all over campus, received a note from the coaching staff.

President Donald Trump has signed a proclamation to suspend international visas for new students at Harvard University, the White House announced Wednesday, in a dramatic escalation of its efforts to block foreign nationals from enrolling at the elite 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.