State regulators in California have ordered Aristotle University -- an unaccredited institution investigated for preying on foreign students -- to close, NBC San Diego reported. The television station, whose original reporting earlier this year prompted an investigation by the Department of Homeland Security, published a letter in which the state Bureau for Private Postsecondary Education said that Aristotle's founder, Xanthi Gionis, would face $50,000 in fines if he didn't shut the school in two weeks.