The Center for Immigration Studies (CIS), in its website section (accessed Sep. 12, 2007) entitled "Terrorism & National Security," offered the following:

“Knowledgeable Americans have come to understand that our welcoming immigration policies are easily exploited by terrorists and that porous borders and lax immigration enforcement are no longer an option. With at least 8 million illegal aliens living in the United States and nearly one million new aliens arriving each year, the potential for terrorists entering the United States undetected is high.”

Sep. 12, 2007