No security expert since September 11th, 2001 has said that restrictive immigration measures would have prevented the terrorist attacks—instead, the key is effective use of good intelligence. Most of the 9/11 hijackers were here on legal visas. Since 9/11, the myriad of measures targeting immigrants in the name of national security have netted no terrorism prosecutions. In fact, several of these measures could have the opposite effect and actually make us less safe, as targeted communities of immigrants are afraid to come forward with information.
(Source: Associated Press/Dow Jones Newswires, “US Senate Subcommittee Hears Immigration Testimony”, Oct. 17, 2001.)
(Source: Cato Institute: “Don’t Blame Immigrants for Terrorism”, Daniel Griswold, Assoc. Director of Cato Institute’s Center for Trade Policy Studies (see: http://www.cato.org/dailys/10-23-01.html)