Legal reasons a U.S. immigrant may be deported

Hello:

To answer the specifics of your question, you would need to contact an attorney in that country.
However, instead of worrying about that now, you should try to win the deportation/removal proceedings now.
I would need to have more facts to determine what he may qualify for and what relief may be available.
I would also need to know if there are crimes and what the sentences are.

Regards,