At least nine students between the University of Colorado and Colorado State University have had their visas revoked by the Department of Homeland Security, spokespeople for the schools have said.The University of Colorado says four students and CSU says six students had their F-1 visas -- which allow international students to study at U.

Five CSU, four CU international students face visa revocations. Rubio defends revocations, claiming national security concerns.

Just days after Secretary of State Marco Rubio said that at least 300 international visas to the U.S. had been canceled, reports are surfacing that at least four student visas in Colorado were among those revoked.