Uhh... How is the first sentence any different from the second? If all 12 million were reported and deported how would that be any different than a forced repatriation program?
I can't believe you cannot see the difference. If you have a large scale round-up of illegals you will need to either temporarily house them or use a transporter to beam them over to Mexico immediately.
If they are stopped by the police, or discovered in a business raid, it will be done over a much longer time period and you will not have the logistics problems you would have with a large scale round-up.
Its really not that hard to understand.
PresdientFelon