It would be best to discuss this matter with an immigration attorney to see if he can be released on an ICE bond is the ICE hold is the only reason he is in custody.
Mr. Driessen is a former Deputy DA in Orange County with over 8 years of criminal law experience. Nothing stated on this site shall in anyway be construed as legal advice, or as creating any attorney client relationship. If you would like to hire Mr. Driessen, feel free to contact him at www.theocduiguy.com.
If he is not legally in the United States, ICE can out a hold on him. You need to contact an immigration attorney to see if he qualifies for some type of immigration relief.
Seth Weinstein, Esq.
Practicing throughout Southern California
This reply should NOT be considered a legal opinion of your case / inquiry. At this time I do not have sufficient factual/legal documentation to give a complete answer to your question and there may be more to the issues you raised then I have set out in my brief reply.
If he was convicted of a felony, he is not eligible for an immigration bond and is likely to be detained while he awaits a deportation hearing. He may have some options, but this is a very complicated area of law and you need to consult with an immigration attorney right away.