=== Bush is simply not the type of person who advocates rounding up illegals and returning them home en masse. That's just reality. ====
There is a way to get illegals to voluntarily leave the country.
1) Declare that you are going to increase the number of worker visas and immigration slots
2) Declare that ANYONE caught illegally in the country will automatically be denied a worker visa or immigration slot for 10 years.
Then, long as we are at it.
Require English proficiency for citizenship
Get rid of the "Born in USA" anchor baby clause
How about taxing money transfers to mexico at a rate of 30 to 50%. If they wish to take money home they can hand carry it.