In reply to Old Skooled:
> I can't understand why there would be so much serious discussion of that possibility right now if there was a clear and well known barrier?
The key reason would we are heading into a hotly contested election which, especially if it includes postal ballots, will become even more so. Neither side is likely to accept the outcome with several prominent figures on both already stating as much. It highly likely the outcome end up on the SC's lap. In which case, an even number of SC justices leaves open the possibility for there being no deciding vote and complete paralysis.
Whether the Dems or the GOP get to choose the appointee, it seems vital one is chosen ASAP. Given Trump is in power at the moment, he seems to have more right than anyone else to preside over that. I get that people are rightly concerned about the prospect. But its worth remembering the guy has a liberal streak, is by no means a classic conservative, and if you put to one side his bellicous language on many issues he is probably left of where most Democrats were just a decade or two ago. He may yet surprise with his ability to choose a middle of the road candidate.