Court challenges if Trump wins? Kamala already said they've got squadrons of lawyers set up if that happens.
In terms of storming the WH - I suspect that will happen (again) when some multi-generational #blueanon stronghold has another police eff-up and of course it will all be blamed on Trump. Let the audience recall that the #blueanon ragers almost broke through and over 60 SS police were injured, as streets and churches burned.
I am sure the Norm Eisen's of the world have lots of other things cooked up as well.
Norm (and similar) are absolute kings in the concept of blame the opponent for which you are already doing