The other thing here that the right are completely conflating here is what the alleged Russia involvement entailed.
Democrats alledged the following in 2016 in terms of Russia's involvement, let me prefix, I'm not a big supporter of the Russia argument, as I believe it takes away accountability of the complete and utter corruption and propaganda set on the American public by American entities right at home.
They allege the following:
-Russian bots undermining democracy through Facebook, and other online social media
-Possible hacking of Diebold machines
The second point has not been substantiated, although the fact that these machines can't be audited is a major flaw in the system.
Trump and the Republicans aren't arguing against the above two points, they're arguing about mail in voting, and those votes being counted. Russia can't "hack" a mailed in ballot
Completely different scenario here, there is no reason or evidence to question the legitimacy of these mailed in ballots.