Dallas-area international students are struggling to navigate why they were told to leave the country immediately after visas were suddenly revoked by federal officials, lawyers working with some of them said.

Students from University of North Texas, UT-Dallas, Texas A&M, UT-Rio Grande, Texas Women’s University, Texas Tech and other schools have been affected.

U.S. immigration authorities have revoked the visas of roughly 90 international students at several Texas universities. The big picture: The Trump administration has revoked the visas of nearly 400 international students across the country in the last three weeks,