How did democrats accuse Trump of Russian collusion if all the states certified the 2016 election?

That seems to be how they prove Biden won the 2020 election.
States certified the election so there’s no way there was election fraud.
But Trumps votes where also certified in 2016 but they carried on
with Russia helped Trump won.

Rhetorical question but one the dumbass republicans should ask the mental tards on TV