SCOTUSblog and Ohio State University Moritz College of Law are jointly sponsoring the 2020 Election Litigation Tracker, so I assume that it's a RS. It currently lists 5 challenges in the Supreme Court:
- Pennsylvania Democratic Party v. Boockvar
- People First of Alabama v. Merrill
- Moore v. Circosta
- Jones v. Secretary of State of Maine
- Democratic National Committee v. Bostelmann
5 cases in Federal district courts:
- Donald J. Trump for President, Inc. v. Boockvar in Western Pennsylvania
- Washington v. Trump in Eastern Washington
- Texas Democratic Party v. Abbott in Western Texas
- Donald J. Trump for President v. Way in New Jersey
- Donald J. Trump for President v. Cegavske in Nevada
and a total of 11 appeals at both the state and federal levels. Additionally, Time(magazine) has a list of Trump campaign lawsuits which, besides listing many cases that were dismissed or denied, shows 2 cases that were accepted by the courts (in Pennsylvania) and 5 cases that were accepted and are still pending or in litigation. At what point is there enough litigation where the claim