U.S. President Donald Trump is threatening to ban mail-in voting ahead of the country's midterm elections — a manoeuvre that could throw the electoral system into disarray and disenfranchise millions of voters who rely on this method to cast a ballot.

Trump has railed against voting by mail since he lost the 2020 election and started touting bogus claims about fraudulent ballots skewing the result.

This time, he's promising an executive order that will stop the well-established practice once and for all, even as scholars say he has absolutely no authority to make a change like that given some of the constitutional realities.

"This is really not a hard question — the president cannot do it. Period," Jeremy Paul, a professor at the Northeastern University School of Law who studies

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