I believe they just changed the law....commit a crime...out you go...now.
In other words, they should have already been out of here.
Christians?? I doubt it.
No ex post facto law... that makes it odd.
The problem with that is that there is no deterrent to committing crime except fear of deportation. Seems to me like they should have to serve the prison term and then be deported. That would be a better deterent than the worst that happens if you get caught is you get deported.