Paraphrasing

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, it 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 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.

The Government told Habib that they would not give him a "waiver of inadmissibility" which is an exception to those who have been denied visas to enter the country. They were able to deny him admittance by quoting the US Patriot Act and saying that he had "engaged in a terrorist activity" even though they showed no proof that Habib had committed any terrorist act.