In response to the Postal Service’s warnings, a few states have quickly moved deadlines — forcing voters to request or cast ballots earlier, or deciding to delay tabulating results while waiting for more ballots to arrive.
https://www.washingtonpost.com/local/md-politics/usps-states-delayed-mail-in-ballots/2020/08/14/64bf3c3c-dcc7-11ea-8051-d5f887d73381_story.html