From the horse's mouth

As a former gubernatorial candidate, I can admire the discipline it takes to stay on message on a single issue. There is no doubt that voter fraud can animate people. But it is one thing to provide a rallying point for supporters and quite another to drag our election infrastructure and legal system into a foundationless set of false claims.

[...]

A better use of time, money and energy would be to address systemic weaknesses in our election systems – such as the distressing lack of national election infrastructure to enforce election integrity, destructive practices to our elections such as gerrymandering, and leveling the playing field so that our elections become fairer and more competitive.

[...]

We vote anonymously − with good reason. No candidate can credibly claim that a fraudulent vote was credited to their opponent unless the person who cast that vote tells us.

This means that a candidate trying to use voter fraud as the reason to change an election result cannot show that the fraudulent votes caused their election loss.

[...]

If voter fraud had impacted the 2020 election, it would already have been proven. Maintaining the lies undermines faith in the foundation of our democracy.

  USA Today

And that will do if they can't prove fraud.

...but hey, do what you want...you will anyway.