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https://www.economist.com/briefing/2020/09/03/donald-trump-is-very-likely-to-challenge-the-results-of-the-us-election
The Economist: Donald Trump is very likely to challenge the results of the US election
If he does so it will be bad, quite possibly very bad indeed
Briefing　Sep 3rd 2020 edition

If Mr Trump refuses to concede, Sean Eldridge, who founded Protect the Results,
vows “an unprecedented presence on the streets.” This year, when the presence
of politics on the streets in the form of justified peaceful protest has been
used a pretext for rioting and looting, and when a Trump supporter has been
arrested for murder after going to Kenosha, Wisconsin as an armed vigilante,
“unprecedented” has a disturbing ring to it.