Secretary of State Marco Rubio estimated that he had signed perhaps more than 300 letters revoking the visas of students, visitors and others to force their expulsion from the United States because of their foreign policy views or criminal activities.

       He has been signing letters daily to revoke visas since taking office in late January, Mr. Rubio told reporters on Thursday night aboard an Air Force passenger jet traveling between Paramaribo, Suriname, and Miami, where he lives with his family. Mr. Rubio was concluding a three-nation tour in the Caribbean and South America.

       “I don’t know actually if it’s primarily student visas,” he said. “It’s a combination of visas. They’re visitors to the country. If they’re taking activities that are counter to our foreign, to our national interest, to our foreign policy, we’ll revoke the visa.”

       He said he reviewed each case himself before signing off on actions that would be taken by immigration agents. Mr. Rubio said that a visa holder charged with a crime while in the United States should automatically lose their visa. He is also expelling permanent U.S. residents by stripping them of their green cards.

       Advertisement

       SKIP ADVERTISEMENT

       “My standard: If we knew this information about them before we gave them a visa, would we have allowed them in?” he said. “And if the answer is no, then we revoke the visa.”

       Mr. Rubio declined to say how the cases arrived at his desk. “We’re not going to talk about the process by which we’re identifying it because obviously we’re looking for more people,” he said.

       Subscribe to The Times to read as many articles as you like.