An instructor at the University of Wisconsin who has said he believes U.S. officials orchestrated the terrorist attacks of Sept. 11, 2001, will be allowed to teach a course on Islam, the school said Monday. Some state politicians had called for the University of Wisconsin-Madison to fire part-time instructor Kevin Barrett after he spoke about his theories on a radio talk show last month. We cannot allow political pressure from critics of unpopular ideas to inhibit the free exchange of ideas," Provost Patrick Farrell said in a statement. "To the extent that his views are discussed, Mr. Barrett has assured me that students will be free - and encouraged - to challenge his viewpoint." The university does not endorse Barrett's theories, Farrell said, noting they are widely believed in parts of the Muslim world.