Article II, Section 1, Clause 4: "The Congress may determine the Time of chusing the Electors, and the Day on which they shall give their Votes; which Day shall be the same throughout the United States."

Any vote cast before or after November 3rd are null and void.

Trump encouraged his supporters to go out and vote on election day. Has the plan been from day one to nullify all (mail-in) votes because they were not cast on election day?

Donald J. Trump @realDonaldTrump: "ANY VOTE THAT CAME IN AFTER ELECTION DAY WILL NOT BE COUNTED!"