President Donald Trump has escalated his standoff with Harvard University, seeking another path to prevent international students from attending the school after a judge blocked an attempt to revoke Harvard’s ability to enroll international students.

President Donald Trump said Wednesday that he will deny visas for foreign students trying to come to the U.S. to attend Harvard University, his latest attack on the prominent Ivy League college.

Harvard University announced Thursday it is challenging the Trump administration’s ban on international students going there in court. President Donald Trump issued an executive order on Wednesday denying visas for foreign students aiming to study at Harvard.