Quoting

http://0-web.ebscohost.com.skyline.cudenver.edu/ehost/detail?vid=9&hid=108&sid=cfc50743-afdd-44e4-aed5-5de807a1349a%40sessionmgr109&bdata=JnNpdGU9ZWhvc3QtbGl2ZQ%3d%3d#db=aph&AN=28819484

At the same time, [the State Department] informed him that it would not give him a "waiver of inadmissibility," which allows entry to persons deemed inadmissible for statutory reasons, if he were to apply for one. The denial was based on a portion of the USA [sic] Patriot Act that excludes aliens who have "engaged in a terrorist activity"; the government did not, however, provide any evidence for its determination that Habib had engaged in terrorist activity or cite a specific section of the Patriot Act defining the type of "terrorist activity" in which Habib supposedly engaged.