Other states will begin doing the same over the next few weeks in an election that's expected to break all records in the number of ballots cast early and by mail.
Facebook and Twitter have both flagged content about Trump's suggestion that supporters should visit polling stations to "make sure" their mailed ballots count. Voting twice is illegal.
The U.S. Postal Service still has a number of hurdles to overcome to support upcoming general election mail-in ballots, its inspector general's office says.
Trump's supporters don't trust voting by mail, said one local Wisconsin GOP chair. "And one of the reasons they don't trust it," he said, "is the president's previous tweets and comments about it."
The Office of the Director of National Intelligence will no longer verbally brief Congress on election interference, instead providing written information, Director John Ratcliffe wrote.
The president has backed off his attacks on the Postal Service but continues to question the integrity of mail ballots, without providing any evidence.
Louis DeJoy reportedly tells officials he's setting up a task force to make sure each mail processing plant has sufficient capacity to handle the expected surge in mailed ballots this year.
Although the president continues to push unverified theories of widespread fraud or foreign interference, the FBI says it has no reporting to suggest the threat is real.
The Trump ally and longtime Republican megadonor testifies regarding cost-cutting measures at the U.S. Postal Service that Democrats say would jeopardize Americans' ability to vote by mail.
The report concludes Wisconsin voters who braved the pandemic and went to the polls in April did not see a surge in COVID-19 infections, although another study reaches the opposite conclusion.
Tens of thousands of ballots have been rejected in key battleground states, where the outcome in November for the presidency and other races could be determined by a small number of votes.
A pair of House Democrats suggest that Postmaster General Louis DeJoy was not part of a pool of candidates cultivated and vetted by an outside hiring firm that was contracted to fill the post.
He voted by mail in Tuesday's Florida primaries but avoided the Postal Service, instead opting to give his ballot to a third party to turn in, a practice Republicans call "ballot harvesting."
Thousands of mail-in ballots routinely arrive without a postmark or with one that isn't legible. Election officials have to decide whether to count those ballots and under what circumstances.
Louis DeJoy, an ally of President Trump's and a major GOP donor, took over leadership of the U.S. Postal Service in May. Lawmakers have questions about his plans for an "organizational realignment."