There's a confrontation coming between the Obama administration and Republicans in Congress over the most basic question of immigration reform: How secure is the U.S. border with Mexico?
Not only does the administration not know -- and perhaps doesn't want to know -- but there are signs the border is less secure than some of the most skeptical Republicans thought.
Last year the Border Patrol began experimenting with a new drone-based surveillance system that had been developed for finding Taliban fighters in Afghanistan. Starting in the fall, officials used the radar-based system over a fairly small portion of the Arizona border. The results were striking.