Potential Legal Remedy For USPS Sabotage (Daily Kos link): Our first priority must be to get votes counted without depending upon intervention by the Court. This means dropping off mail-in ballots at designated collection points rather than depending upon the Post Office, or voting in person. As various commenters have said, depending upon the Roberts court for a favorable ruling cannot be plan A.
Of the many things we must do to make sure Trump cannot stick around after January 20, 2021 is to prevent any criminal interference (domestic and international) with our electoral process that keeps the Democratic victory from being seen as anything other than the rout it is. In short, there must be a Bluenami to keep key people (like the SCOTUS and military leaders) in line.