Quotes from the news wire:
It is incredibly dangerous to support people for office who do not accept the legitimacy of the 2020 election. It suggests that they might be willing to bend or break the rules when it comes to running elections and counting votes in the future, someone who claims falsely that the 2020 election was stolen from Trump lacks credibility and can not be trusted to run a fair election.
Given the tremendous pressure of the pandemic and an election than many voters viewed as existential, election administrators overall did a superb job conducting the election and counting the ballots, without their professionalism, Trump's unsupported allegations of voter fraud would be accepted by more people, because administrative error often looks like cheating to those on the losing end of an election.
When the President says that North Carolina's going to be fraudulent, that North Carolina's going to be rigged, he's speaking with absolutely no credibility. There's no evidence of this. There's no evidence that the states that vote all by mail have larger rates of fraudulent balloting. In fact, fraudulent balloting is rare in all states in the United States.