Democratic lawyers are preparing to challenge any effort by President Trump to swap electors chosen by voters with electors selected by Republican-controlled legislatures. One state of particular concern: Pennsylvania, where the GOP controls the state house.

Why it matters: Trump's refusal to commit to a peaceful transfer of power, together with a widely circulated article in The Atlantic about how bad the worst-case scenarios could get, is drawing new attention to the brutal fights that could jeopardize a final outcome.