Gore could have overturned 2000. Gore actually ruled against efforts to do so advising he had no authority and they failed to get Senators to sign on to it. Waters: “I don’t care that it hasn’t been signed by a member of the Senate!” Gore: “The rules do care.” But if he had ruled otherwise, they could have merely appealed the ruling of the Chair, and overturned him by vote.
It sounds like you’re saying Kamala Harris can overturn this year’s election.