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.

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.

Harvard University said on Thursday that U.S. President Donald Trump's move to bar foreign nationals seeking to study at the Ivy League school from entering the United States is illegal, and asked a judge to block it immediately pending further litigation.