Psyops, definitely. jimjimjim upthread has the right idea. Start by setting up all sorts of alternative news sources each of which tell you to distruct the others. Get the militia movement on side, that's completely critical. Have a convicted traitor running the NRA. The kind of people who volunteer to do their own immigration enforcement, or who seize wildlife reserves. All this lot hate the "federal government", so you have to rebadge the takeover as something else.
Spread reports of election interference by "liberals". Use it as a pretext for cancelling polling in certain counties. Stage a couple of mass shootings at polling places. Bingo.
Spread reports of election interference by "liberals". Use it as a pretext for cancelling polling in certain counties. Stage a couple of mass shootings at polling places. Bingo.