Illegals come across the border seeking a better life. They really need a Savior. A preacher living in the Rio Grand preached at my church Sunday evening.
"I have a prison ministry," he said, "and it breaks my heart that until these guys got to that prison, they had never heard the Word of God."
Joel 2:27 And ye shall know that I am in the midst of Israel, and that I am the Lord your God, and none else; and my people shall never be ashamed.
God's people are a peculiar people. He wants us to stand out from the crowd -- stand up for Christ. You can't pick and chose the people you witness to. You have to talk to whoever He puts in your path. God wants you to talk to them about the Lord.
Never be ashamed to witness. God will give you the opportunity, He will encourage you, and you will be satisfied.