They love hiring illegals because they can treat them horribly and not worry bout getting in trouble. If US labor laws could be universally enforced, there would be no reason for unscrupulous business people to hire undocumented workers, so it could then probably harder for illegal immigrants to find work. These exploitative employers are the cause of most illegal immigration.

That was the first thing I thought of when watching the news clip of the raids.

Trump says 'his company has stopped hiring undocumented immigrants' — but his former housekeeper says that’s not true... (The Daily News)