When I referred to 'they' it was to possible illegal immigrants.
If what you are saying is that you are also saying 'they' is referring to possible illegal immigrants then your question makes no sense as I pointed out.
To replace 'they' with illegal immigrants in your question.
Or if and when 'illegal immigrants' find out they're here?
If 'illegal immgrants' find out they're here?
So again, can you rephrase your question boyo.