There is a lot of evidence the Democrats rigged the election. You refuse to accept the evidence; therefore, you can make the claim that no evidence exists.
They tried to do it again in 2024, but the votes were coming overwhelmingly for Trump and it's a lot tougher rigging the election twice in a row. There were multiple cities and districts that were trying to rig it, but the Republicans were on top of it. There were a few House seats and a couple Senate seats that went Democrat that were a little suspicious.