"Michigan has been hit especially hard by the virus, with more than 50,000 confirmed cases and 5,000 deaths", Nessel wrote in the letter.
In a tweet this week, Michigan Secretary of State Jocelyn Benson said, "No voter should have to choose between their health & their vote". "Voting by mail is easy, convenient, safe, and secure, and every voter in MI has the right to do it".
The current pandemic is being used by political partisans to promote fraud-prone mail-in balloting in order to undermine electoral integrity, election law experts say.
A Columbia University study indicates there's little evidence of vote fraud in the United States, with most such claims attributable to "false claims by the loser of a close race, mischief and administrative or voter error".
There's still some time to request a mail-in ballot. "I will ask to hold up funding to MI if they want to go down this Voter Fraud path!" Trump campaign spokesman Tim Murtaugh asserted "there is no statutory authority for the secretary of state in Michigan to send absentee ballot applications to all voters" - an argument some Michigan Republicans have also made.
"The president's tweet is just another tactic in the GOP's handbook of voter suppression", Nevada State Democratic Party spokeswoman Molly Forgey said.
Trump's comments did not appear to reassure Nessel, who in Wednesday's letter stressed that MI has been "hit especially hard by the virus".
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Voters can download an absentee ballot application from the secretary of state's website. In their zeal to defeat Donald Trump in November, and in their utter refusal to let a good crisis go to waste, Democrats at the national and state levels are using the China Virus as an excuse to promote and enact a nationwide vote-by-mail system. On April 9, First Lady Melania Trump released a video encouraging Americans to do so.
"They pick the ballot - they take them out of mailboxes".
Trump alleged "a lot of people in certain districts don't ever get their ballot". During a stop in Allentown, Pennsylvania, last week, Trump chastised Democratic Gov. Tom Wolf for not opening quickly enough, saying residents were ready to get back to work.
"Because I'm allowed to". When I hear someone say "I support early voting" what I hear is "I think elections are too short and not expensive enough". I went to the polling place at the end of my street.
Mr Trump, who has repeatedly expressed his opposition to mail-in voting, said the expansion in MI and Nevada - two states that could be pivotal in his November 3 re-election bid - could lead to voter fraud.
How much madness did Trump pack into a tweet consisting of only 48 words? About a third of the states require a specific reason to vote by mail.
Michigan Attorney General Dana Nessel said Secretary Benson did nothing improper.