Regardless what you think, you are not the deciding authority to remove people form the United States.
Also, anyone is entitled to legal representation, even a person with a pending DUI charge and undocumented presence. Besides, he has an attorney who is dealing with that professionally, therefore, do not use Avvo to express personal animus against someone, since you do not have a personal involvement in his cases.
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His DUI may be the sauce. What may be the beef is his illegal entry if this is what happened. However, without knowing all the facts, it is impossible to predict the outcome. Only an experienced and unscrupulous lawyer can assess his chances of not being deported.