The NYT article "9/11 Panel Calls Policies on Immigration Ineffective" discusses the immigration programs which were presumably put in place after the 9/11 attacks. It does have a dissenting comment from a former administration counsel. I don't have enough knowledge of these programs to comment, however my thoughts at the time regarding the roundup of immigrants from Middle East countries was that they were designed to fail. In other words, a pro-mass-immigration bureaucrat might have decided to make the program look bad by making a draconian roundup which was doomed to get bad press.

In any case, the article includes supporting quotes from the usual suspects. Read the NYT article in light of these two articles which describe those usual suspects in more detail than the NYT would ever give you: 'The Open Borders Lobby and the Nation's Security After 9/11' and 'Strange Bedfellows: Left and right on immigration'.