The administration has not provided a reason for most cases, but some students have been targeted because of their pro-Palestinian activism.

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

On the heels of at least 15 Texas A&M students and two graduates of the University of Texas at Austin having their student visas revoked without notification, several other Texas universities are now reporting additional students affected by such actions.