100% of all liberal arguments at all times against republicans on the subject of immigration is the perpetual (and absolutely required) refusal to understand the difference between 'legal' and 'Illegal'.
Its inherently impossible for a liberal to acknowledge that these are two different things because if you did every argument on the subject would instantly stop and end up in the argument-landfill, never to return.
22 years of hearing this personally so far
22 more no doubt.