The Democrats have much more to worry about in Arizona other than the presidential race. The fate of the Senate also rests in the hands of the Maricopa County election. Mark Kelly also won Maricopa County, a reliable red county by 80,000 votes.
That means that if the results show that McSally actually won in Maricopa County, she actually won the Senate election as well.
That would mean that the Republicans would control Senate 51-49. It would also create an unusual decision that would have to be made. All of the votes that required Kamala Harris to cast the tie-breaking vote would now be invalid. However, an activist judge might disagree, setting up a constitutional crisis.
It may take a long time to sort out.
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There’s little information out there related to a situation where fraud or errors were discovered that lead to a change of winners in a US Senate race. However, we expect that if fraud was the reason for the difference with reality, then the seat would go to the winner per the legitimate audit.
There is some information on what to do when a Senate seat becomes vacant (but this doesn’t involve fraud being the reason for the vacancy):
Senate seats become vacant for a variety of reasons — the Senator dies in office, resigns in disgrace or resigns to assume another position, usually, an elected or appointed government position.
Procedures for electing Senators are outlined in Article I, Section 3 of the U.S. Constitution, as later amended by paragraph 2 of the Seventeenth (17th) Amendment. Ratified in 1913, the 17th Amendment not only changed how Senators are to be elected (direct election by popular vote) but it also outlined how Senate vacancies are to be filled:
When vacancies happen in the representation of any State in the Senate, the executive authority of such State shall issue writs of election to fill such vacancies: Provided, That the legislature of any State may empower the executive thereof to make temporary appointments until the people fill the vacancies by election as the legislature may direct.