While many claims of voter fraud have been made to this effect by the President Donald J. Trump after losing the election, there is no evidence that this is true at a scale that would impact the election. State election boards have certified election counts, and the courts have rejected lawsuits that alleged mass voter fraud based on lack of evidence.

Almost every claim of fraud has been refuted or explained.

It may be true that there is some small amounts of fraud in all elections, but there is no evidence that there was enough in the 2020 presidential election to sway the outcome of the overall vote.

https://www.washingtonpost.com/elections/interactive/2020/election-integrity/

It was more rigged than a youtuber boxing match.

Its a good meme but people really drank the kool-aid on this one in a sobering way. Its a FASCINATING sociological case study on extremism, propaganda, and the internet.

I find a number of questions like this which are technically true, but in some sense, the "spirit" of the question would warrant a disagree. I'm not sure if there's ever been a US presidential election without a single fraudulent vote, and if there has been, it would be easily a century plus ago. That said, what the question feels like its getting at was were the results fraudulent, i.e. was Trump the legitimate winner.