The constitution says there has to be a set place where elections are held and mail-in voting has no place.

https://www.thelancasterpatriot.com/scotus-to-consider-taking-case-on-constitutionality-of-mail-in-voting/

dec 30 2022 On January 6, 2023, the U.S. Supreme Court could decide to take a case concerning mail-in voting in Pennsylvania, continuing the saga that began on October 31, 2019, when Gov. Tom Wolf signed into law the Republican-backed Act 77.

The problem with these mail-in voting laws, Teufel said, is that they fail to specify a place for someone to vote when they vote by mail, which violates Article 1, Section 4 of the U.S. Constitution. The election clause in that section states, “The
Times, Places and Manner of holding Elections for Senators and Representatives, shall be prescribed in each State by the Legislature thereof; but the Congress may at any time by Law make or alter such Regulations, except as to the Place of Chusing
Senators."

Teufel said that this clause mandates that states must specify places where federal elections are held. Because the mail-in voting law in Pennsylvania does not specify a place, it essentially allows a voter to vote from anywhere in the world. By
requiring a set location, the law allows people to observe the voting process and, he said, “verify that there is nothing being done incorrectly, no corruption, no bribery, no intimidation, et cetera, happening.”

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