Increase Legal Immigration But Close The Borders
For me the immigration issue boilds down to security in the post-9-11 world we have been forced into. I cannot ignore the extant jihad being pursued by factions of the Muslim world (and largely uncriticized in the rest of the Muslim world). Therefore, while the economic arguments and libertarian themes of open borders have a strong sway on my intellect (and were dispositive arguments in my support for the Dubai ports deal and the Chinese purchase of Unocal), the ability of terrorists to enter this country and remain undetected by lax immigration laws and enforcement overcome my natural leanings.
Michelle Malkin explains how illegal immigrants were involved in 9-11 events. She looks at the assistance provide the hijackers that flew the jet into the Pentagon. It is eerie how openly they can act without detection or repercussions.
On the other hand, I would support increased and streamlined legal immigration. I am persuaded that the influx of immigrants is a massive net gain for the US and its economy. Not only do we need the best and the brightest but we also need the uneducated and poor. But as has been said of the Consitution I can apply to a libertarian open borders policy, my support for libertarian principles is not a "suicide pact".