One of the reasons the so called "comprehensive immigration reform bill" failed is because the Bush administration has done everything in their power to avoid border security and enforcement of existing laws against employing illegal aliens.
Even former Rep. Jim Kolbe opposed the stupid idea of pulling Border Patrol personnel off the border to locate them in a permanent checkpoint well inside the United States (which is what the Bush administration wants)
Here's more details.
http://www.azstarnet.com/sn/border/190480.php