You don't know what you are talking about. For example both Democrats andf Republicans know illegal immigrants voted in 2020 but nobody knows how many voted because no extensive investigation was ever done to determine the exact number.
Both Democrats and Republicans know votes were casdt in the names of deap people but again we do not have the exact numbers because election officials did not provide necessary documentation to investigators for that number to be determined.
Both Democrats and Republicans knew before the 2020 election that voting machines were subject to fraud but Democrats blocked investigations of the machines, thus preventing any ability to determine whether the machines were corrupted or not.
Democrats and leftist election officials refused to pourge their bloated voting registries as required by law before the 2020 election, making it impossible to know how many votes were cadst in the names of voters registerd but not allowed to vote.
And so much more. No, the widespread evidence of 2020 election fraud has never been refuted by Democrats - ever.