Harvard University is challenging the Trump administration’s decision to bar the Ivy League school from enrolling foreign students.

The Trump administration's decision to block Harvard University from enrolling foreigners has caused shock and confusion among students. Harvard called the government's move "unlawful" and said it will fight the ban.

Because international students are more likely to pay full tuition, they essentially subsidize other students who receive aid, said educational consultant Chuck Ambrose, former president of the University of Central Missouri.