TRAC - Immigration Enforcement: The Rhetoric, The Reality
Despite repeated claims by high officials of the Bush Administration that fighting terrorism has been the central mission of the Department of Homeland Security (DHS) since it began operating, the data show that in the last three years a claim of terrorism was made against only 12 (0.0015%) out of 814,073 individuals against whom the DHS has filed charges in the immigration courts...

Despite the constant official talk by ICE officials about its war on terrorism campaign, the data on national security and terrorism charges clearly show declining long term trends back to 1992. The incidents of 9/11/2001 and the creation of the Department of Homeland Security appear to have had little discernable impact on these trends.