Ambassador C. Boyden Gray published an editorial in The Hill on September 9, 2020 arguing that universal mail-in voting jeopardizes the equal right to vote. He writes,

States must treat every eligible vote the same. But state universal mail-in procedures and shifting ballot count deadlines jeopardize the equal right to vote. Universal mail-in voting risks both the dilution of legitimate votes and the disenfranchisement of eligible voters — equal protection problems eliminated by common-sense absentee voting procedures.

Read the full editorial at The Hill.