James R. Edwards has a piece in the Washington Times about something we shouldn't forget:

As the Senate starts debating immigration legislation this week, missing will be one of the most important elements for any meaningful immigration reform. That's the need to cut legal immigration.

In fact, the bill before the Senate Judiciary Committee goes the wrong direction. It would blow the lid off some legal immigrant visas, almost doubling the permanent resident visas allotted yearly and giving out thousands more temporary visas.[...and flows, Washington Times, March 13, 2006]

Legal immigration can be as big a problem as illegal immigration, (numbers, displaced workers, crime, welfare, et cetera) and once it's legal, there's nothing that can be done about it.