> I find it hard to keep these discussions separate.
...because they're not separate discussions at all. There is no example in history of mass deportations being done according to a coherent rule of law. These two things are not of the same impetus; mass deportations are a power-grab, and the rule of law interferes with that.
The only way that a nation gets to a point where mass deportations are plausible (in the sense that there are a sufficient number of people who have entered or stayed without going through a state-prescribed process) is that there is already relative domestic tranquility (otherwise, the "problem" would have been noticed decades earlier).
In our case (in the USA), we have plenty of room, plenty of resources, a wonderful and diverse array of immigrant cultures, and the capacity to defend ourselves against bad actors on an individual and/or community level. There is no need whatsoever for a government thousands of miles away (whose authority is decreasingly recognized anyhow) to tell me who my neighbors can be.
It's borderline farcical.