An immigration attorney told CPR News the students have the choice to either self-deport or stay and fight – but that leaves them open to being detained.

Colorado State University said on Wednesday that an additional student had their visa revoked after several were revoked a day earlier. The Department of State acknowledged the move but won't say why they were revoked.

Neither university has identified the students who lost their visas, said what countries they are from, or revealed whether federal officials provided any explanation.