It is laudable that some in  the Church want to support the "oppressed and vulnerable "  in the name of social justice , after all who would not ?  However a closure look  at the current immigrant  controversy reveals that the concept of " Justice "  gets trampled on in the process. 
      Ironically  those immigrants who have "arrived "  without  legal means have themselves perpetuated an injustice on  others who hope and pray  to come to America  and " live the dream "  legally and in harmony with  fairness. 
      The people who line up at the Embassy for Visas or go through the normal naturalization process  are just as poor , uneducated and in dire need as those that pay  and in effect bribe, their way into the USA, and they are being harmed just as  surely  as those people that cut into the line  for medical or food assistance.
  Church leaders who  support illegal immigrants  but  ignore Legal reality. are perpetuating an injustice 
US Citizens and foreign immigrants alike.