The Donald Trump administration opened a historic investigation into J-1 visa fraud at nine US universities, with subpoenas already issued, according to the Department of Labor, in a report by the South China Morning Post.

The announcement was made on Thursday by Inspector General Anthony D’Esposito, at an event alongside Vice-President J.D. Vance, and names Harvard, Yale, Stanford, Brown, the University of Pittsburgh, UC Davis, Caltech, Arizona State University and MIT. The administration singled out China as the focus, warning that Beijing need not break into US research labs if institutions leave their doors open.