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At least two dozen students in the Minnesota State system of colleges and universities have had their visas revoked or immigration records terminated over the past few weeks.

Minnesota State University in Mankato was hit harder than most — it was home to about half of those students. MSU Mankato is the largest school in the system and has more than 1,700 international students.

Jameel Haque is an associate professor of History at Minnesota State University-Mankato, and director of the university’s Kessel Peace Institute.

He said they still don’t know why the students lost their visas.

“It might be related to social media posts. But there’s really no clear answer as to who and why they’re being targeted,” Haque told MPR News host Tom Crann. “There doesn’t seem to be any specific allegations against them except that they voiced opinions that are unpopular with our political leaders.”