Secretary of State Marco Rubio said he's revoked the visas of 'lunatics,' but civil-rights experts say the administration is targeting free speech.

The terminations of the UNC students’ visas comes after similar revocations at NC State University and Duke University, as well as dozens of universities around the country.

Four international students at the University of Michigan have had their visas revoked by the U.S. Department of Homeland Security, according to a university spokesperson.