When the ICE catches you for being illegal, they arrest you and issue a Notice to Appear. If he doesn't have criminal record, then he can be bailed out. The standard bail amount is $5000. He can request a bail hearing before the judge, and request to lower the bail amount due to financial hardship and the judge can lower it to as low as $1500. They cannot deport him right away. You have rights in this country. Only an immigration judge can make the decision on his deportation. Ask him not to talk to ICE. Tell them you want to exercise your right to be silent and ask for an attorney. There is a 24 hour hotline number which can located where your friend is detained. You will need to know his A number though, which is assigned to him when they issue NTA.
If you have questions, comments or concerns don't hesitate to ask me.