The statement from Secretary of State Marco Rubio did not say why his department was examining Harvard’s eligibility to take part in the Exchange Visitor Program, which allows foreign nationals to study or work in the United States through cultural and education exchange programs.

The State Department has launched an investigation into Harvard University’s participation in a program for foreign researchers and visitors, escalating the Trump administration’s campaign to hamstring the school’s ability to enroll international students.

The State Department is investigating whether Harvard University undermines U.S. policy through its participation in a federal educational visa program.