There are no armies of Twitter bots swaying mass public opinion. That's another nonsensical conspiracy theory of the sort of the New York Times has gone all-in on to try and explain how Trump won without having to engage with his policies or arguments.

This article looks at just one news story+research paper alleging a Russian Twitter bot army swaying politics, but in the UK rather than the USA:

https://blog.plan99.net/did-russian-bots-impact-brexit-ad66f...

tl;dr - the paper is filled with fraud but was breathlessly reported by the (London) Times, and it convinced the Prime Minister despite being false.