Trump's executive order and the USPS mail-ballot rule are unconstitutional because they give the federal government, not the states, control over who gets a mail ballot.
Disputes
“The Trump Administration will continue to lawfully enact the agenda President Trump was elected on – which includes the safety and security of our elections.”
CBS News A judge lifts her own nationwide block on Trump's mail-ballot rule while calling the order likely unconstitutional, and two dozen states sue the Postal Service the same day ›
Others on this question
“the U.S. Constitution gives states the power to regulate elections — not the President and not USPS.”