The cost to recruit, background check, train line staff and supervisors is enormous; the salary and benefits would be huge and the time to do all of this would be years, not months. Trump is a demagogue, what he promises is impossible; he is also a charlatan for he has no idea how stupid his promises actually are.
How To Deport 11 Million People Humanely*
"Mark Krikorian, the executive director of the Center for Immigration Studies, said in an email that he had 'no idea' what Trump has in mind in terms of deportation,
but had some suggestions 'to get a significant share of the illegal population to leave, and none of it is ‘inhumane’ by any non-advocacy-group definition.'
"That would include increasing deportation to 2013 levels, requiring employers to use the E-Verify system to check new hires’ immigration status, and making local law enforcement coordinate with Immigration and Customs Enforcement.
"Krikorian also suggested pushing states to stop issuing driver’s licenses to undocumented immigrants.
"At the same time, he said, the government could crack down on people who overstay their visas, and prosecute all unauthorized border-crossers.
“'Do all that, and you’ll see the illegal population shrink significantly, mainly through attrition,' Krikorian wrote."