U.S. Immigration and Customs Enforcement (ICE) is cracking down on international students who are engaged in activities deemed detrimental to the United States.

The Department of State has plans to revoke more than 300 student visas and on Thursday ICE arrested a University of Minnesota (UMN) graduate.

The university sent a letter to students, parents and faculty about the arrest in which it said it was “a deeply concerning situation.”

“We learned that, on March 27 at an off-campus residence, U.S. Immigration and Customs Enforcement officials detained a graduate student enrolled on our Twin Cities campus. We are actively working to gather more details about this incident,” the letter said.

“In cases like this, the University takes steps to ensure students are connected to internal resources and support, such as Student Legal Service and International Student and Scholar Services,” it said.

“The University had no prior knowledge of this incident and did not share any information with federal authorities before it occurred,” the letter, signed by University President Rebecca Cunningham, Vice President for Student Affairs Calvin Phillips and Vice President for Student Affairs Mercedes Ramírez Fernández said.

“It is important to note that our campus departments of public safety, including UMPD, do not enforce federal immigration laws, and our officers do not inquire about an individual’s immigration status. Their focus remains on public safety, fostering trust and maintaining strong relationships across the University community,” it said.

During a meeting Thursday with Guyanese President Irfaan Ali, Secretary of State Marco Rubio said the Department of State may have removed more than 300 visas.

“It might be more than 300 at this point. We do it every day. Every time I find one of these lunatics, I take away their visa,” he said.

He said that international students who intend to join “movements that are involved in doing things like vandalizing universities, harassing students, taking over buildings, creating a ruckus” are not going to get visas.

“Now, once you’ve lost your visa, you’re no longer legally in the United States, and we have a right, like every country in the world has a right, to remove you from our country. So it’s just that simple,” he said.