Trying to cook up the most incendiary way in which Trump could win in 2020 and it would go something like this:
Trump is going up against, say, Elizabeth Warren. Warren wins the popular vote by an utterly indisputable margin - 8%. But Trump ekes out a 270-268 victory in the Electoral College by carrying several swing states by Florida-like margins of only several dozen or hundred votes each. (Or perhaps, even, Warren wins the Electoral College narrowly, but one or a few electors are bribed into crossing the aisle to voting for Trump.) Meanwhile, there is widespread Russian interference, all sorts of hacking of voting machinery, millions of voters prevented from voting, and dirty shenanigans in hundreds of swing-state precincts. Subsequent investigations show ***proof ***that the election was rigged for Trump. Oh, and the 2020 election campaign was several months of nastiness and bile that makes 2016 look like a walk in the park in comparison.
…In such a scenario, the anger would be several times hotter than what it was after Trump’s first win. What kind of civil unrest would we be looking at? It would surely be more intense than the after-election protesting in the streets that took place in November 2016. Would we be looking at widespread riots, bombs and Molotov cocktails, all kinds of physical fights between Trump supporters and opponents, probably multiple assassination attempts of Trump or others, National Guard having to be called up?