Can Trump restrict mail-in voting by executive order and why is he trying?

Critics say ‘election integrity’ plan to compile national voter list is unconstitutional and will be blocked by the courtsDonald Trump on Tuesday signed an executive order seeking to restrict mail-in voting and compile a national voter list in a move that is unprecedented and probably unconstitutional.The order directs the administration to establish a federal list of confirmed citizens that can legally vote in each state, and orders the postal service to send mail-in ballots only to those on the list. During a press conference at the White House, Trump said the administration would like to require voter ID and proof of citizenship, and repeated falsehoods about mail-in voting.