I don't think a giant conspiracy is necessary to prove and I have no idea if there was anything like that but what appears to have happened is huge amounts of ballots were cast in a way that does not conform with state law especially where there was no chain of custody or where observers weren't present, that seems to be the main push from the Trump campaign especially in PA, Wisconsin and Michigan and maybe Nevada and Arizona.
In my opinion much of this will hinge on the Georgia recount, if it flips red next week then the momentum will be there to push on but if it stays blue I think it