This is a story in progress; I’ll try to get more information soon. American Prospect is reporting that Capitol Forum (paywall) is saying Trump’s toady Postmaster General is striking another blow at voting by mail:
The Postal Service has informed states that they’ll need to pay first-class 55-cent postage to mail ballots to voters, rather than the normal 20-cent bulk rate. That nearly triples the per-ballot cost at a time when tens of millions more will be delivered. The rate change would have to go through the Postal Regulatory Commission and, undoubtedly, litigation. But the time frame for that is incredibly short, as ballots go out very soon. [emphasis added]
And of course, states are already in deep financial trouble because of the pandemic and the GOP’s refusal to help them out.