Spurred in part by a critical audit [1] of the American system of monitoring student visas, a group of U.S. senators said Tuesday that they would introduce legislation aimed at tightening controls on institutions that enroll foreign students. The comments by Sen. Charles Schumer and others came at a hearing [2] of the Senate Judiciary Committee, which followed last week's release of a Government Accountability Office report finding that U.S. Immigration and Customs Enforcement, which manages the Student and Exchange Visitor Program, has inadequate processes in place to investigate, identify and combat fraud.